*** FILE AUTOMATICALLY CREATED: DO NOT EDIT, CHANGES WILL BE LOST ***

------------------------------------------------------------------------
INPUT FILE DESCRIPTION

Program: cp.x / CP / Quantum Espresso (version: 6.1)
------------------------------------------------------------------------


Input data format: { } = optional, [ ] = it depends, | = or

All quantities whose dimensions are not explicitly specified are in
HARTREE ATOMIC UNITS. Charge is "number" charge (i.e. not multiplied
by e); potentials are in energy units (i.e. they are multiplied by e)

BEWARE: TABS, DOS <CR><LF> CHARACTERS ARE POTENTIAL SOURCES OF TROUBLE
Comment lines in namelists can be introduced by a "!", exactly as in
fortran code. Comments lines in ``cards'' can be introduced by
either a "!" or a "#" character in the first position of a line.
Do not start any line in ``cards'' with a "/" character.

Structure of the input data:
===============================================================================

&CONTROL
  ...
/

&SYSTEM
 ...
/

&ELECTRONS
...
/

[ &IONS
  ...
 / ]

[ &CELL
  ...
 / ]

[ &WANNIER
  ...
 / ]

ATOMIC_SPECIES
 X  Mass_X  PseudoPot_X
 Y  Mass_Y  PseudoPot_Y
 Z  Mass_Z  PseudoPot_Z

ATOMIC_POSITIONS { alat | bohr | crystal | angstrom }
  X 0.0  0.0  0.0  {if_pos(1) if_pos(2) if_pos(3)}
  Y 0.5  0.0  0.0
  Z O.0  0.2  0.2

[ CELL_PARAMETERS { alat | bohr | angstrom }
   v1(1) v1(2) v1(3)
   v2(1) v2(2) v2(3)
   v3(1) v3(2) v3(3) ]

[ OCCUPATIONS
   f_inp1(1)  f_inp1(2)  f_inp1(3) ... f_inp1(10)
   f_inp1(11) f_inp1(12) ... f_inp1(nbnd)
 [ f_inp2(1)  f_inp2(2)  f_inp2(3) ... f_inp2(10)
   f_inp2(11) f_inp2(12) ... f_inp2(nbnd) ] ]

[ CONSTRAINTS
   nconstr  { constr_tol }
   constr_type(.)   constr(1,.)   constr(2,.) [ constr(3,.)   constr(4,.) ] { constr_target(.) } ]

[ ATOMIC_FORCES
   label_1 Fx(1) Fy(1) Fz(1)
   .....
   label_n Fx(n) Fy(n) Fz(n) ]



========================================================================
NAMELIST: &CONTROL

   +--------------------------------------------------------------------
   Variable:       calculation
   
   Type:           CHARACTER
   Default:        'cp'
   Description:    a string describing the task to be performed:
                      'cp',
                      'scf',
                      'nscf',
                      'relax',
                      'vc-relax',
                      'vc-cp',
                      'cp-wf',
                      'vc-cp-wf'
                   
                      (vc = variable-cell).
                      (wf = Wannier functions).
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       title
   
   Type:           CHARACTER
   Default:        'MD Simulation '
   Description:    reprinted on output.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       verbosity
   
   Type:           CHARACTER
   Default:        'low'
   Description:    In order of decreasing verbose output:
                    'debug' | 'high' | 'medium' | 'low','default' | 'minimal'
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       isave
   
   Type:           INTEGER
   See:            ndr
   See:            ndw
   Default:        100
   Description:    Number of steps between successive savings of
                   information needed to restart the run.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       restart_mode
   
   Type:           CHARACTER
   Default:        'restart'
   Description:    'from_scratch'   : from scratch
                   'restart'        : from previous interrupted run
                   'reset_counters' : continue a previous simulation,
                                      performs  "nstep" new steps, resetting
                                      the counter and averages
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nstep
   
   Type:           INTEGER
   Description:    number of Car-Parrinello steps performed in this run
   Default:        50
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       iprint
   
   Type:           INTEGER
   Default:        10
   Description:    Number of steps between successive writings of relevant physical quantities
                   to files named as "prefix.???" depending on "prefix" parameter.
                   In the standard output relevant quantities are written every 10*iprint steps.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tstress
   
   Type:           LOGICAL
   Default:        .false.
   Description:    Write stress tensor to standard output each "iprint" steps.
                   It is set to .TRUE. automatically if
                   calculation='vc-relax'
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tprnfor
   
   Type:           LOGICAL
   Default:        .false.
   Description:    print forces. Set to .TRUE. when ions are moving.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       dt
   
   Type:           REAL
   Default:        1.D0
   Description:    time step for molecular dynamics, in Hartree atomic units
                   (1 a.u.=2.4189 * 10^-17 s : beware, PW code use
                    Rydberg atomic units, twice that much!!!)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       outdir
   
   Type:           CHARACTER
   Default:        value of the ESPRESSO_TMPDIR environment variable if set;
                   current directory ('./') otherwise
   Description:    input, temporary, trajectories and output files are found
                   in this directory.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       saverho
   
   Type:           LOGICAL
   Description:    This flag controls the saving of charge density in CP codes:
                   If  .TRUE.        save charge density to restart dir,
                   If .FALSE. do not save charge density.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       prefix
   
   Type:           CHARACTER
   Default:        'cp'
   Description:    prepended to input/output filenames:
                     prefix.pos : atomic positions
                     prefix.vel : atomic velocities
                     prefix.for : atomic forces
                     prefix.cel : cell parameters
                     prefix.str : stress tensors
                     prefix.evp : energies
                     prefix.hrs : Hirshfeld effective volumes (ts-vdw)
                     prefix.eig : eigen values
                     prefix.nos : Nose-Hoover variables
                     prefix.spr : spread of Wannier orbitals
                     prefix.wfc : center of Wannier orbitals
                     prefix.ncg : number of Poisson CG steps (PBE0)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ndr
   
   Type:           INTEGER
   Default:        50
   Description:    Units for input and output restart file.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ndw
   
   Type:           INTEGER
   Default:        50
   Description:    Units for input and output restart file.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tabps
   
   Type:           LOGICAL
   Default:        .false.
   Description:    .true. to compute the volume and/or the surface of an isolated
                   system for finite pressure/finite surface tension calculations
                   (PRL 94, 145501 (2005); JCP 124, 074103 (2006)).
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       max_seconds
   
   Type:           REAL
   Default:        1.D+7, or 150 days, i.e. no time limit
   Description:    jobs stops after max_seconds CPU time. Used to prevent
                   a hard kill from the queuing system.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       etot_conv_thr
   
   Type:           REAL
   Default:        1.0D-4
   Description:    convergence threshold on total energy (a.u) for ionic
                   minimization: the convergence criterion is satisfied
                   when the total energy changes less than etot_conv_thr
                   between two consecutive scf steps.
                   See also forc_conv_thr - both criteria must be satisfied
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       forc_conv_thr
   
   Type:           REAL
   Default:        1.0D-3
   Description:    convergence threshold on forces (a.u) for ionic
                   minimization: the convergence criterion is satisfied
                   when all components of all forces are smaller than
                   forc_conv_thr.
                   See also etot_conv_thr - both criteria must be satisfied
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ekin_conv_thr
   
   Type:           REAL
   Default:        1.0D-6
   Description:    convergence criterion for electron minimization:
                   convergence is achieved when "ekin < ekin_conv_thr".
                   See also etot_conv_thr - both criteria must be satisfied.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       disk_io
   
   Type:           CHARACTER
   Default:        'default'
   Description:    'high': CP code will write Kohn-Sham wfc files and additional
                           information in data-file.xml in order to restart
                           with a PW calculation or to use postprocessing tools.
                           If disk_io is not set to 'high', the data file
                           written by CP will not be readable by PW or PostProc.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       memory
   
   Type:           CHARACTER
   Default:        'default'
   Description:    'small': memory-saving tricks are implemented. Currently:
                            - the G-vectors are sorted only locally, not globally
                            - they are not collected and written to file
                            For large systems, the memory and time gain is sizable
                            but the resulting data files are not portable - use it
                            only if you do not need to re-read the data file
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       pseudo_dir
   
   Type:           CHARACTER
   Default:        value of the $ESPRESSO_PSEUDO environment variable if set;
                   '$HOME/espresso/pseudo/' otherwise
   Description:    directory containing pseudopotential files
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tefield
   
   Type:           LOGICAL
   Default:        .FALSE.
   Description:    If .TRUE. a homogeneous finite electric field described
                   through the modern theory of the polarization is applied.
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
NAMELIST: &SYSTEM

   +--------------------------------------------------------------------
   Variable:       ibrav
   
   Type:           INTEGER
   Status:         REQUIRED
   Description:    Bravais-lattice index. If ibrav /= 0, specify EITHER
                     [ celldm(1)-celldm(6) ] OR [ A,B,C,cosAB,cosAC,cosBC ]
                     but NOT both. The lattice parameter "alat" is set to
                     alat = celldm(1) (in a.u.) or alat = A (in Angstrom);
                     see below for the other parameters.
                     For ibrav=0 specify the lattice vectors in CELL_PARAMETER,
                     optionally the lattice parameter alat = celldm(1) (in a.u.)
                     or = A (in Angstrom), or else it is taken from CELL_PARAMETERS
                   
                   ibrav      structure                   celldm(2)-celldm(6)
                                                        or: b,c,cosab,cosac,cosbc
                     0          free
                         crystal axis provided in input: see card CELL_PARAMETERS
                   
                     1          cubic P (sc)
                         v1 = a(1,0,0),  v2 = a(0,1,0),  v3 = a(0,0,1)
                   
                     2          cubic F (fcc)
                         v1 = (a/2)(-1,0,1),  v2 = (a/2)(0,1,1), v3 = (a/2)(-1,1,0)
                   
                     3          cubic I (bcc)
                         v1 = (a/2)(1,1,1),  v2 = (a/2)(-1,1,1),  v3 = (a/2)(-1,-1,1)
                   
                     4          Hexagonal and Trigonal P        celldm(3)=c/a
                         v1 = a(1,0,0),  v2 = a(-1/2,sqrt(3)/2,0),  v3 = a(0,0,c/a)
                   
                     5          Trigonal R, 3fold axis c        celldm(4)=cos(alpha)
                         The crystallographic vectors form a three-fold star around
                         the z-axis, the primitive cell is a simple rhombohedron:
                         v1 = a(tx,-ty,tz),   v2 = a(0,2ty,tz),   v3 = a(-tx,-ty,tz)
                         where c=cos(alpha) is the cosine of the angle alpha between
                         any pair of crystallographic vectors, tx, ty, tz are:
                           tx=sqrt((1-c)/2), ty=sqrt((1-c)/6), tz=sqrt((1+2c)/3)
                    -5          Trigonal R, 3fold axis <111>    celldm(4)=cos(alpha)
                         The crystallographic vectors form a three-fold star around
                         <111>. Defining a' = a/sqrt(3) :
                         v1 = a' (u,v,v),   v2 = a' (v,u,v),   v3 = a' (v,v,u)
                         where u and v are defined as
                           u = tz - 2*sqrt(2)*ty,  v = tz + sqrt(2)*ty
                         and tx, ty, tz as for case ibrav=5
                         Note: if you prefer x,y,z as axis in the cubic limit,
                               set  u = tz + 2*sqrt(2)*ty,  v = tz - sqrt(2)*ty
                               See also the note in Modules/latgen.f90
                   
                     6          Tetragonal P (st)               celldm(3)=c/a
                         v1 = a(1,0,0),  v2 = a(0,1,0),  v3 = a(0,0,c/a)
                   
                     7          Tetragonal I (bct)              celldm(3)=c/a
                         v1=(a/2)(1,-1,c/a),  v2=(a/2)(1,1,c/a),  v3=(a/2)(-1,-1,c/a)
                   
                     8          Orthorhombic P                  celldm(2)=b/a
                                                                celldm(3)=c/a
                         v1 = (a,0,0),  v2 = (0,b,0), v3 = (0,0,c)
                   
                     9          Orthorhombic base-centered(bco) celldm(2)=b/a
                                                                celldm(3)=c/a
                         v1 = (a/2, b/2,0),  v2 = (-a/2,b/2,0),  v3 = (0,0,c)
                    -9          as 9, alternate description
                         v1 = (a/2,-b/2,0),  v2 = (a/2, b/2,0),  v3 = (0,0,c)
                   
                    10          Orthorhombic face-centered      celldm(2)=b/a
                                                                celldm(3)=c/a
                         v1 = (a/2,0,c/2),  v2 = (a/2,b/2,0),  v3 = (0,b/2,c/2)
                   
                    11          Orthorhombic body-centered      celldm(2)=b/a
                                                                celldm(3)=c/a
                         v1=(a/2,b/2,c/2),  v2=(-a/2,b/2,c/2),  v3=(-a/2,-b/2,c/2)
                   
                    12          Monoclinic P, unique axis c     celldm(2)=b/a
                                                                celldm(3)=c/a,
                                                                celldm(4)=cos(ab)
                         v1=(a,0,0), v2=(b*cos(gamma),b*sin(gamma),0),  v3 = (0,0,c)
                         where gamma is the angle between axis a and b.
                   -12          Monoclinic P, unique axis b     celldm(2)=b/a
                                                                celldm(3)=c/a,
                                                                celldm(5)=cos(ac)
                         v1 = (a,0,0), v2 = (0,b,0), v3 = (c*cos(beta),0,c*sin(beta))
                         where beta is the angle between axis a and c
                   
                    13          Monoclinic base-centered        celldm(2)=b/a
                                                                celldm(3)=c/a,
                                                                celldm(4)=cos(ab)
                         v1 = (  a/2,         0,                -c/2),
                         v2 = (b*cos(gamma), b*sin(gamma), 0),
                         v3 = (  a/2,         0,                  c/2),
                         where gamma is the angle between axis a and b
                   
                    14          Triclinic                       celldm(2)= b/a,
                                                                celldm(3)= c/a,
                                                                celldm(4)= cos(bc),
                                                                celldm(5)= cos(ac),
                                                                celldm(6)= cos(ab)
                         v1 = (a, 0, 0),
                         v2 = (b*cos(gamma), b*sin(gamma), 0)
                         v3 = (c*cos(beta),  c*(cos(alpha)-cos(beta)cos(gamma))/sin(gamma),
                              c*sqrt( 1 + 2*cos(alpha)cos(beta)cos(gamma)
                                        - cos(alpha)^2-cos(beta)^2-cos(gamma)^2 )/sin(gamma) )
                     where alpha is the angle between axis b and c
                            beta is the angle between axis a and c
                           gamma is the angle between axis a and b
   +--------------------------------------------------------------------
   
   ///---
      EITHER:
      
      +--------------------------------------------------------------------
      Variable:       celldm(i), i=1,6
      
      Type:           REAL
      See:            ibrav
      Description:    Crystallographic constants - see the "ibrav" variable.
                      Specify either these OR A,B,C,cosAB,cosBC,cosAC NOT both.
                      Only needed values (depending on "ibrav") must be specified
                      alat = celldm(1) is the lattice parameter "a" (in BOHR)
                      If ibrav=0, only celldm(1) is used if present;
                      cell vectors are read from card CELL_PARAMETERS
      +--------------------------------------------------------------------
      
      OR:
      
      +--------------------------------------------------------------------
      Variables:      A, B, C, cosAB, cosAC, cosBC
      
      Type:           REAL
      Description:    Traditional crystallographic constants: a,b,c in ANGSTROM
                        cosAB = cosine of the angle between axis a and b (gamma)
                        cosAC = cosine of the angle between axis a and c (beta)
                        cosBC = cosine of the angle between axis b and c (alpha)
                      The axis are chosen according to the value of "ibrav".
                      Specify either these OR "celldm" but NOT both.
                      Only needed values (depending on "ibrav") must be specified
                      The lattice parameter alat = A (in ANGSTROM )
                      If ibrav = 0, only A is used if present;
                      cell vectors are read from card CELL_PARAMETERS
      +--------------------------------------------------------------------
      
   \\\---
   
   +--------------------------------------------------------------------
   Variable:       nat
   
   Type:           INTEGER
   Status:         REQUIRED
   Description:    number of atoms in the unit cell
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ntyp
   
   Type:           INTEGER
   Status:         REQUIRED
   Description:    number of types of atoms in the unit cell
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nbnd
   
   Type:           INTEGER
   Default:        for an insulator, nbnd = number of valence bands
                   (nbnd = # of electrons /2);
                   for a metal, 20% more (minimum 4 more)
   Description:    number of electronic states (bands) to be calculated.
                   Note that in spin-polarized calculations the number of
                   k-point, not the number of bands per k-point, is doubled
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tot_charge
   
   Type:           REAL
   Default:        0.0
   Description:    total charge of the system. Useful for simulations with charged cells.
                   By default the unit cell is assumed to be neutral (tot_charge=0).
                   tot_charge=+1 means one electron missing from the system,
                   tot_charge=-1 means one additional electron, and so on.
                   
                   In a periodic calculation a compensating jellium background is
                   inserted to remove divergences if the cell is not neutral.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tot_magnetization
   
   Type:           REAL
   Default:        -1 [unspecified]
   Description:    total majority spin charge - minority spin charge.
                   Used to impose a specific total electronic magnetization.
                   If unspecified, the tot_magnetization variable is ignored
                   and the electronic magnetization is determined by the
                   occupation numbers (see card OCCUPATIONS) read from input.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ecutwfc
   
   Type:           REAL
   Status:         REQUIRED
   Description:    kinetic energy cutoff (Ry) for wavefunctions
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ecutrho
   
   Type:           REAL
   Default:        4 * ecutwfc
   Description:    kinetic energy cutoff (Ry) for charge density and potential
                   For norm-conserving pseudopotential you should stick to the
                   default value, you can reduce it by a little but it will
                   introduce noise especially on forces and stress.
                   If there are ultrasoft PP, a larger value than the default is
                   often desirable (ecutrho = 8 to 12 times ecutwfc, typically).
                   PAW datasets can often be used at 4*ecutwfc, but it depends
                   on the shape of augmentation charge: testing is mandatory.
                   The use of gradient-corrected functional, especially in cells
                   with vacuum, or for pseudopotential without non-linear core
                   correction, usually requires an higher values of ecutrho
                   to be accurately converged.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variables:      nr1, nr2, nr3
   
   Type:           INTEGER
   See:            ecutrho
   Description:    three-dimensional FFT mesh (hard grid) for charge
                   density (and scf potential). If not specified
                   the grid is calculated based on the cutoff for
                   charge density.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variables:      nr1s, nr2s, nr3s
   
   Type:           INTEGER
   Description:    three-dimensional mesh for wavefunction FFT and for the smooth
                   part of charge density ( smooth grid ).
                   Coincides with nr1, nr2, nr3 if ecutrho = 4 * ecutwfc ( default )
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variables:      nr1b, nr2b, nr3b
   
   Type:           INTEGER
   Description:    dimensions of the "box" grid for Ultrasoft pseudopotentials
                   must be specified if Ultrasoft PP are present
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       occupations
   
   Type:           CHARACTER
   Description:    a string describing the occupation of the electronic states.
                   In the case of conjugate gradient style of minimization
                   of the electronic states, if occupations is set to 'ensemble',
                   this allows ensemble DFT calculations for metallic systems
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       degauss
   
   Type:           REAL
   Default:        0.D0 Ry
   Description:    parameter for the smearing function, only used for ensemble DFT
                   calculations
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       smearing
   
   Type:           CHARACTER
   Description:    a string describing the kind of occupations for electronic states
                   in the case of ensemble DFT (occupations == 'ensemble' );
                   now only Fermi-Dirac ('fd') case is implemented
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nspin
   
   Type:           INTEGER
   Default:        1
   Description:    nspin = 1 :  non-polarized calculation (default)
                   
                   nspin = 2 :  spin-polarized calculation, LSDA
                                (magnetization along z axis)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ecfixed
   
   Type:           REAL
   Default:        0.0
   See:            q2sigma
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       qcutz
   
   Type:           REAL
   Default:        0.0
   See:            q2sigma
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       q2sigma
   
   Type:           REAL
   Default:        0.1
   Description:    ecfixed, qcutz, q2sigma:  parameters for modified functional to be
                   used in variable-cell molecular dynamics (or in stress calculation).
                   "ecfixed" is the value (in Rydberg) of the constant-cutoff;
                   "qcutz" and "q2sigma" are the height and the width (in Rydberg)
                   of the energy step for reciprocal vectors whose square modulus
                   is greater than "ecfixed". In the kinetic energy, G^2 is
                   replaced by G^2 + qcutz * (1 + erf ( (G^2 - ecfixed)/q2sigma) )
                   See: M. Bernasconi et al, J. Phys. Chem. Solids 56, 501 (1995)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       input_dft
   
   Type:           CHARACTER
   Default:        read from pseudopotential files
   Description:    Exchange-correlation functional: eg 'PBE', 'BLYP' etc
                   See Modules/funct.f90 for allowed values.
                   Overrides the value read from pseudopotential files.
                   Use with care and if you know what you are doing!
                   
                   Use 'PBE0' to perform hybrid functional calculation using Wannier functions.
                   Allowed calculation: 'cp-wf' and 'vc-cp-wf'
                   See CP specific user manual for further guidance (or in CPV/Doc/user_guide.tex)
                   and examples in CPV/examples/EXX-wf-example.
                   Also see related keywords starting with exx_.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_fraction
   
   Type:           REAL
   Default:        it depends on the specified functional
   Description:    Fraction of EXX for hybrid functional calculations. In the case of
                   input_dft='PBE0', the default value is 0.25.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       lda_plus_u
   
   Type:           LOGICAL
   Default:        .FALSE.
   Description:    lda_plus_u = .TRUE. enables calculation with LDA+U
                                     ("rotationally invariant"). See also Hubbard_U.
                                     Anisimov, Zaanen, and Andersen, PRB 44, 943 (1991);
                                     Anisimov et al., PRB 48, 16929 (1993);
                                     Liechtenstein, Anisimov, and Zaanen, PRB 52, R5467 (1994);
                                     Cococcioni and de Gironcoli, PRB 71, 035105 (2005).
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       Hubbard_U(i), i=1,ntyp
   
   Type:           REAL
   Default:        0.D0 for all species
   Status:         LDA+U works only for a few selected elements. Modify
                   CPV/ldaU.f90 if you plan to use LDA+U with an
                   element that is not configured there.
   Description:    Hubbard_U(i): parameter U (in eV) for LDA+U calculations.
                   Currently only the simpler, one-parameter LDA+U is
                   implemented (no "alpha" or "J" terms)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       vdw_corr
   
   Type:           CHARACTER
   Default:        'none'
   Description:    Type of Van der Waals correction. Allowed values:
                   
                      'grimme-d2', 'Grimme-D2', 'DFT-D', 'dft-d': semiempirical Grimme's DFT-D2.
                       Optional variables: "london_s6", "london_rcut"
                       S. Grimme, J. Comp. Chem. 27, 1787 (2006),
                       V. Barone et al., J. Comp. Chem. 30, 934 (2009).
                   
                       'TS', 'ts', 'ts-vdw', 'ts-vdW', 'tkatchenko-scheffler': Tkatchenko-Scheffler
                        dispersion corrections with first-principle derived C6 coefficients
                        Optional variables: "ts_vdw_econv_thr", "ts_vdw_isolated"
                        See A. Tkatchenko and M. Scheffler, Phys. Rev. Lett. 102, 073005 (2009)
                   
                       'XDM', 'xdm': Exchange-hole dipole-moment model. Optional variables: "xdm_a1", "xdm_a2"
                        (implemented in PW only)
                        A. D. Becke and E. R. Johnson, J. Chem. Phys. 127, 154108 (2007)
                         A. Otero de la Roza, E. R. Johnson, J. Chem. Phys. 136, 174109 (2012)
                   
                   Note that non-local functionals (eg vdw-DF) are NOT specified here but in "input_dft"
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       london_s6
   
   Type:           REAL
   Default:        0.75
   Description:    global scaling parameter for DFT-D. Default is good for PBE.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       london_rcut
   
   Type:           REAL
   Default:        200
   Description:    cutoff radius (a.u.) for dispersion interactions
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ts_vdw
   
   Type:           LOGICAL
   Default:        .FALSE.
   Description:    OBSOLESCENT, same as vdw_corr='TS'
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ts_vdw_econv_thr
   
   Type:           REAL
   Default:        1.D-6
   Description:    Optional: controls the convergence of the vdW energy (and forces). The default value
                   is a safe choice, likely too safe, but you do not gain much in increasing it
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ts_vdw_isolated
   
   Type:           LOGICAL
   Default:        .FALSE.
   Description:    Optional: set it to .TRUE. when computing the Tkatchenko-Scheffler vdW energy
                   for an isolated (non-periodic) system.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       assume_isolated
   
   Type:           CHARACTER
   Default:        'none'
   Description:    Used to perform calculation assuming the system to be
                   isolated (a molecule of a clustr in a 3D supercell).
                   
                   Currently available choices:
                   
                   'none' (default): regular periodic calculation w/o any correction.
                   
                   'makov-payne', 'm-p', 'mp' : the Makov-Payne correction to the
                            total energy is computed.
                            Theory:
                            G.Makov, and M.C.Payne,
                            "Periodic boundary conditions in ab initio
                            calculations" , Phys.Rev.B 51, 4014 (1995)
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
NAMELIST: &ELECTRONS

   +--------------------------------------------------------------------
   Variable:       electron_maxstep
   
   Type:           INTEGER
   Default:        100
   Description:    maximum number of iterations in a scf step
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       electron_dynamics
   
   Type:           CHARACTER
   Default:        'none'
   Description:    set how electrons should be moved
                   'none'    : electronic degrees of freedom (d.o.f.) are kept fixed
                   'sd'      : steepest descent algorithm is used to minimize
                             electronic d.o.f.
                   'damp'    : damped dynamics is used to propagate electronic d.o.f.
                   'verlet'  : standard Verlet algorithm is used to propagate
                             electronic d.o.f.
                   'cg'      : conjugate gradient is used to converge the
                             wavefunction at each ionic step. 'cg' can be used
                             interchangeably with 'verlet' for a couple of ionic
                             steps in order to "cool down" the electrons and
                             return them back to the Born-Oppenheimer surface.
                             Then 'verlet' can be restarted again. This procedure
                             is useful when electronic adiabaticity in CP is lost
                             yet the ionic velocities need to be preserved.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       conv_thr
   
   Type:           REAL
   Default:        1.D-6
   Description:    Convergence threshold for selfconsistency:
                   estimated energy error < conv_thr
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       niter_cg_restart
   
   Type:           INTEGER
   Default:        20
   Description:    frequency in iterations for which the conjugate-gradient algorithm
                   for electronic relaxation is restarted
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       efield
   
   Type:           REAL
   Default:        0.D0
   Description:    Amplitude of the finite electric field (in a.u.;
                   1 a.u. = 51.4220632*10^10 V/m). Used only if tefield=.TRUE.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       epol
   
   Type:           INTEGER
   Default:        3
   Description:    direction of the finite electric field (only if tefield == .TRUE.)
                   In the case of a PARALLEL calculation only the case epol==3
                   is implemented
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       emass
   
   Type:           REAL
   Default:        400.D0
   Description:    effective electron mass in the CP Lagrangian, in atomic units
                   ( 1 a.u. of mass = 1/1822.9 a.m.u. = 9.10939 * 10^-31 kg )
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       emass_cutoff
   
   Type:           REAL
   Default:        2.5D0
   Description:    mass cut-off (in Rydberg) for the Fourier acceleration
                   effective mass is rescaled for "G" vector components with
                   kinetic energy above "emass_cutoff"
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       orthogonalization
   
   Type:           CHARACTER
   Default:        'ortho'
   Description:    selects the orthonormalization method for electronic wave
                   functions
                   'ortho'        : use iterative algorithm - if it doesn't converge,
                                    reduce the timestep, or use options ortho_max
                                    and ortho_eps, or use Gram-Schmidt instead just
                                    to start the simulation
                   'Gram-Schmidt' : use Gram-Schmidt algorithm - to be used ONLY in
                                    the first few steps.
                                    YIELDS INCORRECT ENERGIES AND EIGENVALUES.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ortho_eps
   
   Type:           REAL
   Default:        1.D-8
   Description:    tolerance for iterative orthonormalization
                   meaningful only if orthogonalization = 'ortho'
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ortho_max
   
   Type:           INTEGER
   Default:        20
   Description:    maximum number of iterations for orthonormalization
                   meaningful only if orthogonalization = 'ortho'
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ortho_para
   
   Type:           INTEGER
   Default:        0
   Status:         OBSOLETE: use command-line option " -nd XX" instead
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       electron_damping
   
   Type:           REAL
   Default:        0.1D0
   Description:    damping frequency times delta t, optimal values could be
                   calculated with the formula :
                            SQRT( 0.5 * LOG( ( E1 - E2 ) / ( E2 - E3 ) ) )
                   where E1, E2, E3 are successive values of the DFT total energy
                   in a steepest descent simulations.
                   meaningful only if " electron_dynamics = 'damp' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       electron_velocities
   
   Type:           CHARACTER
   Description:    'zero'      : restart setting electronic velocities to zero
                   'default'   : restart using electronic velocities of the
                               previous run
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       electron_temperature
   
   Type:           CHARACTER
   Default:        'not_controlled'
   Description:    'nose'            : control electronic temperature using Nose
                                     thermostat. See also "fnosee" and "ekincw".
                   'rescaling'       : control electronic temperature via velocities
                                     rescaling.
                   'not_controlled'  : electronic temperature is not controlled.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ekincw
   
   Type:           REAL
   Default:        0.001D0
   Description:    value of the average kinetic energy (in atomic units) forced
                   by the temperature control
                   meaningful only with " electron_temperature /= 'not_controlled' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       fnosee
   
   Type:           REAL
   Default:        1.D0
   Description:    oscillation frequency of the nose thermostat (in terahertz)
                   meaningful only with " electron_temperature = 'nose' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       startingwfc
   
   Type:           CHARACTER
   Default:        'random'
   Description:    'atomic': start from superposition of atomic orbitals
                             (not yet implemented)
                   
                   
                   'random': start from random wfcs. See "ampre".
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tcg
   
   Type:           LOGICAL
   Default:        .FALSE.
   Description:    if .TRUE. perform a conjugate gradient minimization of the
                   electronic states for every ionic step.
                   It requires Gram-Schmidt orthogonalization of the electronic
                   states.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       maxiter
   
   Type:           INTEGER
   Default:        100
   Description:    maximum number of conjugate gradient iterations for
                   conjugate gradient minimizations of electronic states
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       passop
   
   Type:           REAL
   Default:        0.3D0
   Description:    small step used in the  conjugate gradient minimization
                   of the electronic states.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       n_inner
   
   Type:           INTEGER
   Default:        2
   Description:    number of internal cycles for every conjugate gradient
                   iteration only for ensemble DFT
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ninter_cold_restart
   
   Type:           INTEGER
   Default:        1
   Description:    frequency in iterations at which a full inner cycle, only
                   for cold smearing, is performed
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       lambda_cold
   
   Type:           REAL
   Default:        0.03D0
   Description:    step for inner cycle with cold smearing, used when a not full
                   cycle is performed
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       grease
   
   Type:           REAL
   Default:        1.D0
   Description:    a number <= 1, very close to 1: the damping in electronic
                   damped dynamics is multiplied at each time step by "grease"
                   (avoids overdamping close to convergence: Obsolete ?)
                   grease = 1 : normal damped dynamics
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ampre
   
   Type:           REAL
   Default:        0.D0
   Description:    amplitude of the randomization ( allowed values: 0.0 - 1.0 )
                   meaningful only if " startingwfc = 'random' "
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
NAMELIST: &IONS

   INPUT THIS NAMELIST ONLY IF CALCULATION = 'CP', 'RELAX', 'VC-RELAX', 'VC-CP', 'CP-WF', 'VC-CP-WF'
   
   +--------------------------------------------------------------------
   Variable:       ion_dynamics
   
   Type:           CHARACTER
   Description:    Specify the type of ionic dynamics.
                   
                    For constrained dynamics or constrained optimisations add the
                    CONSTRAINTS card (when the card is present the SHAKE algorithm is
                                      automatically used).
                   'none'    : ions are kept fixed
                   'sd'      : steepest descent algorithm is used to minimize ionic
                               configuration
                   'cg'      : conjugate gradient algorithm is used to minimize ionic
                               configuration
                   'damp'    : damped dynamics is used to propagate ions
                   'verlet'  : standard Verlet algorithm is used to propagate ions
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ion_positions
   
   Type:           CHARACTER
   Default:        'default'
   Description:    'default '  : if restarting, use atomic positions read from the
                                 restart file; in all other cases, use atomic
                                 positions from standard input.
                   
                   'from_input' : restart the simulation with atomic positions read
                                 from standard input, even if restarting.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ion_velocities
   
   Type:           CHARACTER
   Default:        'default'
   See:            tempw
   Description:    initial ionic velocities
                   'default'     : restart the simulation with atomic velocities read
                                   from the restart file
                   'change_step' : restart the simulation with atomic velocities read
                                   from the restart file, with rescaling due to the
                                   timestep change, specify the old step via tolp
                                   as in tolp = 'old_time_step_value' in au
                   'random'      : start the simulation with random atomic velocities
                   'from_input'  : restart the simulation with atomic velocities read
                                   from standard input - see card 'ATOMIC_VELOCITIES'
                                   BEWARE: works only if restart_mode='from_scratch',
                                   tested only with electrons_dynamics='cg'
                   'zero'        : restart the simulation with atomic velocities set
                                   to zero
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ion_damping
   
   Type:           REAL
   Default:        0.2D0
   Description:    damping frequency times delta t, optimal values could be
                     calculated with the formula :
                     SQRT( 0.5 * LOG( ( E1 - E2 ) / ( E2 - E3 ) ) )
                     where E1, E2, E3 are successive values of the DFT total energy
                     in a steepest descent simulations.
                     meaningful only if " ion_dynamics = 'damp' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ion_radius(i), i=1,ntyp
   
   Type:           REAL
   Default:        0.5 a.u. for all species
   Description:    ion_radius(i): pseudo-atomic radius of the i-th atomic species
                   used in Ewald summation. Typical values: between 0.5 and 2.
                   Results should NOT depend upon such parameters if their values
                   are properly chosen. See also "iesr".
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       iesr
   
   Type:           INTEGER
   Default:        1
   Description:    The real-space contribution to the Ewald summation is performed
                   on iesr*iesr*iesr cells. Typically iesr=1 is sufficient to have
                   converged results.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ion_nstepe
   
   Type:           INTEGER
   Default:        1
   Description:    number of electronic steps per ionic step.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       remove_rigid_rot
   
   Type:           LOGICAL
   Default:        .FALSE.
   Description:    This keyword is useful when simulating the dynamics and/or the
                   thermodynamics of an isolated system. If set to true the total
                   torque of the internal forces is set to zero by adding new forces
                   that compensate the spurious interaction with the periodic
                   images. This allows for the use of smaller supercells.
                   
                   BEWARE: since the potential energy is no longer consistent with
                   the forces (it still contains the spurious interaction with the
                   repeated images), the total energy is not conserved anymore.
                   However the dynamical and thermodynamical properties should be
                   in closer agreement with those of an isolated system.
                   Also the final energy of a structural relaxation will be higher,
                   but the relaxation itself should be faster.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ion_temperature
   
   Type:           CHARACTER
   Default:        'not_controlled'
   Description:    'nose'           : control ionic temperature using Nose-Hoover
                                      thermostat  see parameters "fnosep", "tempw",
                                      "nhpcl", "ndega", "nhptyp"
                   'rescaling'      : control ionic temperature via velocities
                                      rescaling. see parameter "tolp"
                   'not_controlled' : ionic temperature is not controlled
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tempw
   
   Type:           REAL
   Default:        300.D0
   Description:    value of the ionic temperature (in Kelvin) forced by the
                   temperature control.
                   meaningful only with " ion_temperature /= 'not_controlled' "
                   or when the initial velocities are set to 'random'
                   "ndega" controls number of degrees of freedom used in
                   temperature calculation
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       fnosep
   
   Type:           REAL
   Default:        1.D0
   Description:    oscillation frequency of the nose thermostat (in terahertz)
                   [note that 3 terahertz = 100 cm^-1]
                   meaningful only with " ion_temperature = 'nose' "
                   for Nose-Hoover chain one can set frequencies of all thermostats
                   ( fnosep = X Y Z etc. ) If only first is set, the defaults for
                   the others will be same.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tolp
   
   Type:           REAL
   Default:        100.D0
   Description:    tolerance (in Kelvin) of the rescaling. When ionic temperature
                   differs from "tempw" more than "tolp" apply rescaling.
                   meaningful only with " ion_temperature = 'rescaling' "
                   and with ion_velocities='change_step', where it specifies
                   the old timestep
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nhpcl
   
   Type:           INTEGER
   Default:        1
   Description:    number of thermostats in the Nose-Hoover chain
                   currently maximum allowed is 4
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nhptyp
   
   Type:           INTEGER
   Default:        0
   Description:    type of the "massive" Nose-Hoover chain thermostat
                   nhptyp=1 uses a NH chain per each atomic type
                   nhptyp=2 uses a NH chain per atom, this one is useful
                   for extremely rapid equipartitioning (equilibration is a
                   different beast)
                   nhptyp=3 together with nhgrp allows fine grained thermostat
                   control
                   NOTE: if using more than 1 thermostat per system there will
                   be a common thermostat added on top of them all, to disable
                   this common thermostat specify nhptyp=-X instead of nhptyp=X
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nhgrp(i), i=1,ntyp
   
   Type:           INTEGER
   Default:        0
   Description:    specifies which thermostat group to use for given atomic type
                   when >0 assigns all the atoms in this type to thermostat
                   labeled nhgrp(i), when =0 each atom in the type gets its own
                   thermostat. Finally, when <0, then this atomic type will have
                   temperature "not controlled". Example: HCOOLi, with types H (1), C(2), O(3), Li(4);
                   setting nhgrp={2 2 0 -1} will add a common thermostat for both H & C,
                   one thermostat per each O (2 in total), and a non-updated thermostat
                   for Li which will effectively make temperature for Li "not controlled"
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       fnhscl(i), i=1,ntyp
   
   Type:           REAL
   Default:        (Nat_{total}-1)/Nat_{total}
   Description:    these are the scaling factors to be used together with nhptyp=3 and nhgrp(i)
                   in order to take care of possible reduction in the degrees of freedom due to
                   constraints. Suppose that with the previous example HCOOLi, C-H bond is
                   constrained. Then, these 2 atoms will have 5 degrees of freedom in total instead
                   of 6, and one can set fnhscl={5/6 5/6 1. 1.}. This way the target kinetic energy
                   for H&C will become 6(kT/2)*5/6 = 5(kT/2). This option is to be used for
                   simulations with many constraints, such as rigid water with something else in there
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       ndega
   
   Type:           INTEGER
   Default:        0
   Description:    number of degrees of freedom used for temperature calculation
                   ndega <= 0 sets the number of degrees of freedom to
                   [3*nat-abs(ndega)], ndega > 0 is used as the target number
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tranp(i), i=1,ntyp
   
   Type:           LOGICAL
   See:            amprp
   Default:        .false.
   Description:    If .TRUE. randomize ionic positions for the
                   atomic type corresponding to the index.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       amprp(i), i=1,ntyp
   
   Type:           REAL
   See:            amprp
   Default:        0.D0
   Description:    amplitude of the randomization for the atomic type corresponding
                   to the index i ( allowed values: 0.0 - 1.0 ).
                   meaningful only if " tranp(i) = .TRUE.".
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       greasp
   
   Type:           REAL
   Default:        1.D0
   Description:    same as "grease", for ionic damped dynamics.
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
NAMELIST: &CELL

   INPUT THIS NAMELIST ONLY IF CALCULATION = 'VC-RELAX', 'VC-CP', 'VC-CP-WF'
   
   +--------------------------------------------------------------------
   Variable:       cell_parameters
   
   Type:           CHARACTER
   Description:    'default'      : restart the simulation with cell parameters read
                                  from the restart file or "celldm" if
                                  "restart = 'from_scratch'"
                   'from_input'   : restart the simulation with cell parameters
                                  from standard input.
                                  ( see the card 'CELL_PARAMETERS' )
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       cell_dynamics
   
   Type:           CHARACTER
   Default:        'none'
   Description:    set how cell should be moved
                   'none'      : cell is kept fixed
                   'sd'        : steepest descent algorithm is used to optimise the
                                 cell
                   'damp-pr'   : damped dynamics is used to optimise the cell
                                 ( Parrinello-Rahman method ).
                   'pr'        : standard Verlet algorithm is used to propagate
                                 the cell ( Parrinello-Rahman method ).
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       cell_velocities
   
   Type:           CHARACTER
   Description:    'zero'      : restart setting cell velocity to zero
                   'default'   : restart using cell velocity of the previous run
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       cell_damping
   
   Type:           REAL
   Default:        0.1D0
   Description:    damping frequency times delta t, optimal values could be
                   calculated with the formula :
                            SQRT( 0.5 * LOG( ( E1 - E2 ) / ( E2 - E3 ) ) )
                   where E1, E2, E3 are successive values of the DFT total energy
                   in a steepest descent simulations.
                   meaningful only if " cell_dynamics = 'damp' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       press
   
   Type:           REAL
   Default:        0.D0
   Description:    Target pressure [KBar] in a variable-cell md or relaxation run.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wmass
   
   Type:           REAL
   Default:        0.75*Tot_Mass/pi**2 for Parrinello-Rahman MD;
                   0.75*Tot_Mass/pi**2/Omega**(2/3) for Wentzcovitch MD
   Description:    Fictitious cell mass [amu] for variable-cell simulations
                   (both 'vc-md' and 'vc-relax')
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       cell_factor
   
   Type:           REAL
   Default:        1.2D0
   Description:    Used in the construction of the pseudopotential tables.
                   It should exceed the maximum linear contraction of the
                   cell during a simulation.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       cell_temperature
   
   Type:           CHARACTER
   Default:        'not_controlled'
   Description:    'nose'            : control cell temperature using Nose thermostat
                                       see parameters "fnoseh" and "temph".
                   'rescaling'       : control cell temperature via velocities
                                       rescaling.
                   'not_controlled'  : cell temperature is not controlled.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       temph
   
   Type:           REAL
   Default:        0.D0
   Description:    value of the cell temperature (in ???) forced
                   by the temperature control.
                   meaningful only with " cell_temperature /= 'not_controlled' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       fnoseh
   
   Type:           REAL
   Default:        1.D0
   Description:    oscillation frequency of the nose thermostat (in terahertz)
                   meaningful only with " cell_temperature = 'nose' "
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       greash
   
   Type:           REAL
   Default:        1.D0
   Description:    same as "grease", for cell damped dynamics
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       cell_dofree
   
   Type:           CHARACTER
   Default:        'all'
   Description:    Select which of the cell parameters should be moved:
                   
                   all     = all axis and angles are moved
                   x       = only the x component of axis 1 (v1_x) is moved
                   y       = only the y component of axis 2 (v2_y) is moved
                   z       = only the z component of axis 3 (v3_z) is moved
                   xy      = only v1_x and v2_y are moved
                   xz      = only v1_x and v3_z are moved
                   yz      = only v2_y and v3_z are moved
                   xyz     = only v1_x, v2_y, v3_z are moved
                   shape   = all axis and angles, keeping the volume fixed
                   2Dxy    = only x and y components are allowed to change
                   2Dshape = as above, keeping the area in xy plane fixed
                   volume  = isotropic variations of v1_x, v2_y, v3_z, keeping
                             the shape fixed. Should be used only with ibrav=1.
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
NAMELIST: &PRESS_AI

   INPUT THIS NAMELIST ONLY WHEN TABPS = .TRUE.
   
   +--------------------------------------------------------------------
   Variable:       abivol
   
   Type:           LOGICAL
   Default:        .false.
   Description:    .true. for finite pressure calculations
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       abivol
   
   Type:           LOGICAL
   Default:        .false.
   Description:    .true. for finite surface tension calculations
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       P_ext
   
   Type:           REAL
   Default:        0.D0
   Description:    external pressure in GPa
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       pvar
   
   Type:           LOGICAL
   Default:        .false.
   Description:    .true. for variable pressure calculations
                   pressure changes linearly with time:
                   Delta_P = (P_fin - P_in)/nstep
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       P_in
   
   Type:           REAL
   Default:        0.D0
   Description:    only if pvar = .true.
                   initial value of the external pressure (GPa)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       P_fin
   
   Type:           REAL
   Default:        0.D0
   Description:    only if pvar = .true.
                   final value of the external pressure (GPa)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       Surf_t
   
   Type:           REAL
   Default:        0.D0
   Description:    Surface tension (in a.u.; typical values 1.d-4 - 1.d-3)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       rho_thr
   
   Type:           REAL
   Default:        0.D0
   Description:    threshold parameter which defines the electronic charge density
                   isosurface to compute the 'quantum' volume of the system
                   (typical values: 1.d-4 - 1.d-3)
                   (corresponds to alpha in PRL 94 145501 (2005))
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       dthr
   
   Type:           REAL
   Default:        0.D0
   Description:    thikness of the external skin of the electronic charge density
                   used to compute the 'quantum' surface
                   (typical values: 1.d-4 - 1.d-3; 50% to 100% of rho_thr)
                   (corresponds to Delta in PRL 94 145501 (2005))
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
NAMELIST: &WANNIER

   ONLY IF CALCULATION = 'CP-WF', 'VC-CP-WF'
   
   Output files used by Wannier Function options are the following
   
         fort.21: Used only when calwf=5, contains the full list of g-vecs.
         fort.22: Used Only when calwf=5, contains the coeffs. corresponding
                  to the g-vectors in fort.21
         fort.24: Used with calwf=3,contains the average spread
         fort.25: Used with calwf=3, contains the individual Wannier
                  Function Spread of each state
         fort.26: Used with calwf=3, contains the wannier centers along a
                  trajectory.
         fort.27: Used with calwf=3 and 4,  contains some general runtime
                  information from ddyn, the subroutine that actually
                  does the localization of the orbitals.
         fort.28: Used only if efield=.TRUE. , contains the polarization
                  contribution to the total energy.
   
   Also, The center of mass is fixed during the Molecular Dynamics.
   
   BEWARE : THIS WILL ONLY WORK IF THE NUMBER OF PROCESSORS IS LESS THAN OR
            EQUAL TO THE NUMBER OF STATES.
   
   Nota Bene 1:   For calwf = 5, wffort is not used. The
                  Wannier/Wave(function) coefficients are written to unit 22
                  and the corresponding g-vectors (basis vectors) are
                  written to unit 21. This option gives the g-vecs and
                  their coeffs. in reciprocal space, and the coeffs. are
                  complex. You will have to convert them to real space
                  if you want to plot them for visualization. calwf=1 gives
                  the orbital densities in real space, and this is usually
                  good enough for visualization.
   
   +--------------------------------------------------------------------
   Variable:       wf_efield
   
   Type:           LOGICAL
   Default:        .false.
   Description:    If dynamics will be done in the presence of a field
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wf_switch
   
   Type:           LOGICAL
   Default:        .false.
   Description:    Whether to turn on the field adiabatically (adiabatic switch)
                   if true, then nbeg is set to 0.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       sw_len
   
   Type:           INTEGER
   Default:        1
   Description:    No. of iterations over which the field will be turned on
                   to its final value. Starting value is 0.0
                   If sw_len < 0, then it is set to 1.
                   If you want to just optimize structures on the presence of a
                   field, then you may set this to 1 and run a regular geometry
                   optimization.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variables:      efx0, efy0, efz0
   
   Type:           REAL
   See:            0.D0
   Description:    Initial values of the field along x, y, and z directions
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variables:      efx1, efy1, efz1
   
   Type:           REAL
   See:            0.D0
   Description:    Final values of the field along x, y, and z directions
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wfsd
   
   Type:           INTEGER
   Default:        1
   Description:    Localization algorithm for Wannier function calculation:
                   wfsd=1  Damped Dynamics
                   wfsd=2  Steepest-Descent / Conjugate-Gradient
                   wfsd=3  Jocobi Rotation
                   Remember, this is consistent with all the calwf options
                   as well as the tolw (see below).
                   Not a good idea to Wannier dynamics with this if you are
                   using restart='from_scratch' option, since the spreads
                   converge fast in the beginning and ortho goes bananas.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wfdt
   
   Type:           REAL
   Default:        5.D0
   Description:    The minimum step size to take in the SD/CG direction
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       maxwfdt
   
   Type:           REAL
   Default:        0.3D0
   Description:    The maximum step size to take in the SD/CG direction
                   The code calculates an optimum step size, but that may be
                   either too small (takes forever to converge)  or too large
                   (code goes crazy) . This option keeps the step size between
                   wfdt and maxwfdt. In my experience 0.1 and 0.5 work quite
                   well. (but don't blame me if it doesn't work for you)
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nit
   
   Type:           INTEGER
   Default:        10
   Description:    Number of iterations to do for Wannier convergence.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nsd
   
   Type:           INTEGER
   Default:        10
   Description:    Out of a total of NIT iterations, NSD will be Steepest-Descent
                   and ( nit - nsd ) will be Conjugate-Gradient.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wf_q
   
   Type:           REAL
   Default:        1500.D0
   Description:    Fictitious mass of the A matrix used for obtaining
                   maximally localized Wannier functions. The unitary
                   transformation matrix U is written as exp(A) where
                   A is a anti-hermitian matrix. The Damped-Dynamics is performed
                   in terms of the A matrix, and then U is computed from A.
                   Usually a value between 1500 and 2500 works fine, but should
                   be tested.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wf_friction
   
   Type:           REAL
   Default:        0.3D0
   Description:    Damping coefficient for Damped-Dynamics.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nsteps
   
   Type:           INTEGER
   Default:        20
   Description:    Number of Damped-Dynamics steps to be performed per CP
                   iteration.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       tolw
   
   Type:           REAL
   Default:        1.D-8
   Description:    Convergence criterion for localization.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       adapt
   
   Type:           LOGICAL
   Default:        .true.
   Description:    Whether to adapt the damping parameter dynamically.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       calwf
   
   Type:           INTEGER
   Default:        3
   Description:    Wannier Function Options, can be 1,2,3,4,5
                   
                   1. Output the Wannier function density, nwf and wffort
                      are used for this option. see below.
                   2. Output the Overlap matrix O_i,j=<w_i|exp{iGr}|w_j>. O is
                      written to unit 38. For details on how O is constructed,
                      see below.
                   3. Perform nsteps of Wannier dynamics per CP iteration, the
                      orbitals are now Wannier Functions, not Kohn-Sham orbitals.
                      This is a Unitary transformation of the occupied subspace
                      and does not leave the CP Lagrangian invariant. Expectation
                      values remain the same. So you will **NOT** have a constant
                      of motion during the run. Don't freak out, its normal.
                   4. This option starts for the KS states and does 1 CP iteration
                      and nsteps of Damped-Dynamics to generate  maximally
                      localized wannier functions. Its useful when you have the
                      converged KS groundstate and want to get to the converged
                      Wannier function groundstate in 1 CP Iteration.
                   5. This option is similar to calwf 1, except that the output is
                      the Wannier function/wavefunction, and not the orbital
                      density. See nwf below.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       nwf
   
   Type:           INTEGER
   Default:        0
   Description:    This option is used with calwf 1 and calwf 5. with calwf=1,
                   it tells the code how many Orbital densities are to be
                   output. With calwf=5, set this to 1(i.e calwf=5 only writes
                   one state during one run. so if you want 10 states, you have
                   to run the code 10 times). With calwf=1, you can print many
                   orbital densities in a single run.
                   See also the PLOT_WANNIER card for specifying the states to
                   be printed.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       wffort
   
   Type:           INTEGER
   Default:        40
   Description:    This tells the code where to dump the orbital densities. Used
                    only with CALWF=1. for e.g. if you want to print 2 orbital
                    densities, set calwf=1, nwf=2 and wffort to an appropriate
                    number (e.g. 40) then the first orbital density will be
                    output to fort.40, the second to fort.41 and so on. Note that
                    in the current implementation, the following units are used
                    21,22,24,25,26,27,28,38,39,77,78 and whatever you define as
                    ndr and ndw. so use number other than these.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       writev
   
   Type:           LOGICAL
   Default:        .false.
   Description:    Output the charge density (g-space) and the list of g-vectors
                   This is useful if you want to reconstruct the electrostatic
                   potential using the Poisson equation. If .TRUE. then the
                   code will output the g-space charge density and the list
                   if G-vectors, and STOP.
                   Charge density is written to : CH_DEN_G_PARA.ispin (1 or 2
                   depending on the number of spin types) or CH_DEN_G_SERL.ispin
                   depending on if the code is being run in parallel or serial
                   G-vectors are written to G_PARA or G_SERL.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_neigh
   
   Type:           INTEGER
   Default:        60
   Description:    An initial guess on the maximum number of neighboring (overlapping) Wannier functions.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_dis_cutoff
   
   Type:           REAL
   Default:        8.0
   Description:    Radial cutoff distance (in bohr) for including overlapping Wannier function pairs
                   in EXX calculations.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_poisson_eps
   
   Type:           REAL
   Default:        1.0D-6
   Description:    Poisson solver convergence criterion during computation of the EXX potential.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_ps_rcut_self
   
   Type:           REAL
   Default:        6.0
   Description:    Radial cutoff distance (in bohr) to compute the self EXX energy.
                   This distance determines the radius of the Poisson sphere centered at
                   a given Wannier function center, and should be large enough to cover
                   the majority of the orbital charge density.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_ps_rcut_pair
   
   Type:           REAL
   Default:        5.0
   Description:    Radial cutoff distance (in bohr) to compute the pair EXX energy.
                   This distance determines the radius of the Poisson sphere centered at
                   the midpoint of two overlapping Wannier functions, and should be
                   large enough to cover the majority of the orbital overlap charge density.
                   This parameter can generally be chosen as smaller than exx_ps_rcut_self.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_me_rcut_self
   
   Type:           REAL
   Default:        10.0
   Description:    Radial cutoff distance (in bohr) for the multipole-expansion sphere
                   centered at a given Wannier function center.
                   The far-field self EXX potential in this sphere is generated with
                   multipole expansion of the orbital charge density.
   +--------------------------------------------------------------------
   
   +--------------------------------------------------------------------
   Variable:       exx_me_rcut_pair
   
   Type:           REAL
   Default:        7.0
   Description:    Radial cutoff distance (in bohr) for the multipole-expansion sphere
                   centered at the midpoint of two overlapping Wannier functions.
                   The far-field pair EXX potential in this sphere is generated with
                   a multipole expansion of the orbital overlap charge density.
                   This parameter can generally be chosen as smaller than exx_me_rcut_self.
   +--------------------------------------------------------------------
   
===END OF NAMELIST======================================================


========================================================================
CARD: ATOMIC_SPECIES 

   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      ATOMIC_SPECIES 
         X(1)     Mass_X(1)     PseudoPot_X(1)     
         X(2)     Mass_X(2)     PseudoPot_X(2)     
         . . . 
         X(ntyp)  Mass_X(ntyp)  PseudoPot_X(ntyp)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Variable:       X
      
      Type:           CHARACTER
      Description:    label of the atom. Acceptable syntax:
                      chemical symbol X (1 or 2 characters, case-insensitive)
                      or chemical symbol plus a number or a letter, as in
                      "Xn" (e.g. Fe1) or "X_*" or "X-*" (e.g. C1, C_h;
                      max total length cannot exceed 3 characters)
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variable:       Mass_X
      
      Type:           REAL
      Description:    mass of the atomic species [amu: mass of C = 12]
                      not used if calculation='scf', 'nscf', 'bands'
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variable:       PseudoPot_X
      
      Type:           CHARACTER
      Description:    File containing PP for this species.
                      
                      The pseudopotential file is assumed to be in the new UPF format.
                      If it doesn't work, the pseudopotential format is determined by
                      the file name:
                      
                      *.vdb or *.van     Vanderbilt US pseudopotential code
                      *.RRKJ3            Andrea Dal Corso's code (old format)
                      none of the above  old PWscf norm-conserving format
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: ATOMIC_POSITIONS { alat | bohr | angstrom | crystal }

   ________________________________________________________________________
   * IF calculation == 'bands' OR calculation == 'nscf' : 
   
      Specified atomic positions will be IGNORED and those from the
      previous scf calculation will be used instead !!!
      
       
   * ELSE IF  : 
   
      /////////////////////////////////////////
      // Syntax:                             //
      /////////////////////////////////////////
      
         ATOMIC_POSITIONS { alat | bohr | angstrom | crystal }
            X(1)    x(1)    y(1)    z(1)    {  if_pos(1)(1)    if_pos(2)(1)    if_pos(3)(1)    }  
            X(2)    x(2)    y(2)    z(2)    {  if_pos(1)(2)    if_pos(2)(2)    if_pos(3)(2)    }  
            . . . 
            X(nat)  x(nat)  y(nat)  z(nat)  {  if_pos(1)(nat)  if_pos(2)(nat)  if_pos(3)(nat)  }  
      
      /////////////////////////////////////////
      
       
   ENDIF
   ________________________________________________________________________
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Card's flags:   { alat | bohr | angstrom | crystal }
      
      Default:        (DEPRECATED) bohr
      Description:    alat    : atomic positions are in cartesian coordinates,
                                in units of the lattice parameter (either
                                celldm(1) or A).
                      
                      bohr    : atomic positions are in cartesian coordinate,
                                in atomic units (i.e. Bohr).
                                If no option is specified, 'bohr' is assumed;
                                not specifying units is DEPRECATED and will no
                                longer be allowed in the future
                      
                      angstrom: atomic positions are in cartesian coordinates,
                                in Angstrom
                      
                      crystal : atomic positions are in crystal coordinates, i.e.
                                in relative coordinates of the primitive lattice
                                vectors as defined either in card CELL_PARAMETERS
                                or via the ibrav + celldm / a,b,c... variables
      +--------------------------------------------------------------------


      +--------------------------------------------------------------------
      Variable:       X
      
      Type:           CHARACTER
      Description:    label of the atom as specified in ATOMIC_SPECIES
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variables:      x, y, z
      
      Type:           REAL
      Description:    atomic positions
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variables:      if_pos(1), if_pos(2), if_pos(3)
      
      Type:           INTEGER
      Default:        1
      Description:    component i of the force for this atom is multiplied by if_pos(i),
                      which must be either 0 or 1.  Used to keep selected atoms and/or
                      selected components fixed in MD dynamics or
                      structural optimization run.
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: ATOMIC_VELOCITIES { a.u }

   OPTIONAL CARD, READS VELOCITIES (IN ATOMIC UNITS) FROM STANDARD INPUT
   
   when starting with ion_velocities="from_input" it is convenient
   to perform few steps (~5-10) with a smaller time step (0.5 a.u.)
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      ATOMIC_VELOCITIES { a.u }
         V(1)    vx(1)    vy(1)    vz(1)    
         V(2)    vx(2)    vy(2)    vz(2)    
         . . . 
         V(nat)  vx(nat)  vy(nat)  vz(nat)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Card's flags:   { a.u }
      
      +--------------------------------------------------------------------


      +--------------------------------------------------------------------
      Variable:       V
      
      Type:           CHARACTER
      Description:    label of the atom as specified in ATOMIC_SPECIES
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variables:      vx, vy, vz
      
      Type:           REAL
      Description:    atomic velocities along x y and z direction
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: CELL_PARAMETERS { bohr | angstrom | alat }

   OPTIONAL CARD, NEEDED ONLY IF IBRAV = 0 IS SPECIFIED, IGNORED OTHERWISE !
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      CELL_PARAMETERS { bohr | angstrom | alat }
         v1(1)  v1(2)  v1(3)  
         v2(1)  v2(2)  v2(3)  
         v3(1)  v3(2)  v3(3)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Card's flags:   { bohr | angstrom | alat }
      
      Description:    'bohr'/'angstrom': lattice vectors in bohr radii / angstrom.
                      'alat' / nothing specified: lattice vectors in units or the
                      lattice parameter (either celldm(1) or a). Not specifing
                      units is DEPRECATED and will not be allowed in the future.
                      If nothing specified and no lattice parameter specified,
                      'bohr' is assumed - DEPRECATED, will no longer be allowed
      +--------------------------------------------------------------------


      +--------------------------------------------------------------------
      Variables:      v1, v2, v3
      
      Type:           REAL
      Description:    Crystal lattice vectors:
                          v1(1)  v1(2)  v1(3)    ... 1st lattice vector
                          v2(1)  v2(2)  v2(3)    ... 2nd lattice vector
                          v3(1)  v3(2)  v3(3)    ... 3rd lattice vector
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: REF_CELL_PARAMETERS { bohr | angstrom }

         OPTIONAL CARD, NEEDED ONLY IF ONE WANTS TO DO VARIABLE CELL CALCULATIONS ACCURATELY.
   THE REFERENCE CELL GENERATES ADDITIONAL BUFFER PLANEWAVES.
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      REF_CELL_PARAMETERS { bohr | angstrom }
         v1(1)  v1(2)  v1(3)  
         v2(1)  v2(2)  v2(3)  
         v3(1)  v3(2)  v3(3)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Card's flags:   { bohr | angstrom }
      
      Description:    bohr / angstrom: reference cell parameters in bohr radii / angstrom.
                      
                      To mimic a constant effective planewave kinetic energy (ecfixed) during a
                      variable-cell calculation, the specified reference cell has to be large enough
                      such that the individual cell vector lengths of the fluctuating cell do not
                      exceed the corresponding reference lattice vector lengths during the entire
                      calculation. The cost of the calculation will increase with the increasing
                      size of the reference cell. The user must test for the proper reference cell
                      parameters.
                      
                      The reference cell parameters should be used in conjunction with q2sigma,
                      qcutz, and ecfixed. See q2sigma for more information about mimicking constant
                      effective planewave kinetic energy (ecfixed) during variable-cell calculations.
                      
                      The reference cell parameters should be chosen as an isotropic scaling of the
                      initial cell of the system. This means that the reference cell should have
                      the same shape as the initial simulatoin cell. The reference cell parameters should
                      NOT be changed throughout a given simulatoin. Typically, 2%-10% scaling of
                      the unit cell vectors are sufficient. However, the cell fluctuations depend on
                      the system and the thermodynamic conditions. So again user must test for the proper
                      choice of reference cell parameters.
      +--------------------------------------------------------------------


      +--------------------------------------------------------------------
      Variables:      v1, v2, v3
      
      Type:           REAL
      Description:    REF_CELL_PARAMETERS { bohr | angstrom }
                      v1(1)  v1(2)  v1(3)    ... 1st reference lattice vector
                      v2(1)  v2(2)  v2(3)    ... 2nd reference lattice vector
                      v3(1)  v3(2)  v3(3)    ... 3rd reference lattice vector
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: CONSTRAINTS 

   OPTIONAL CARD, USED FOR CONSTRAINED DYNAMICS OR CONSTRAINED OPTIMISATIONS
   
   When this card is present the SHAKE algorithm is automatically used.
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      CONSTRAINTS 
         nconstr { constr_tol }
         constr_type(1)        constr(1)(1)        constr(2)(1)        [  constr(3)(1)        constr(4)(1)        ]  {  constr_target(1)        }  
         constr_type(2)        constr(1)(2)        constr(2)(2)        [  constr(3)(2)        constr(4)(2)        ]  {  constr_target(2)        }  
         . . . 
         constr_type(nconstr)  constr(1)(nconstr)  constr(2)(nconstr)  [  constr(3)(nconstr)  constr(4)(nconstr)  ]  {  constr_target(nconstr)  }  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Variable:       nconstr
      
      Type:           INTEGER
      Description:    Number of constraints.
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variable:       constr_tol
      
      Type:           REAL
      Description:    Tolerance for keeping the constraints satisfied.
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variable:       constr_type
      
      Type:           CHARACTER
      Description:    Type of constrain :
                      
                      'type_coord'      : constraint on global coordination-number, i.e. the
                                          average number of atoms of type B surrounding the
                                          atoms of type A. The coordination is defined by
                                          using a Fermi-Dirac.
                                          (four indexes must be specified).
                      
                      'atom_coord'      : constraint on local coordination-number, i.e. the
                                          average number of atoms of type A surrounding a
                                          specific atom. The coordination is defined by
                                          using a Fermi-Dirac.
                                          (four indexes must be specified).
                      
                      'distance'        : constraint on interatomic distance
                                          (two atom indexes must be specified).
                      
                      'planar_angle'    : constraint on planar angle
                                          (three atom indexes must be specified).
                      
                      'torsional_angle' : constraint on torsional angle
                                          (four atom indexes must be specified).
                      
                      'bennett_proj'    : constraint on the projection onto a given direction
                                          of the vector defined by the position of one atom
                                          minus the center of mass of the others.
                                          ( Ch.H. Bennett in Diffusion in Solids, Recent
                                            Developments, Ed. by A.S. Nowick and J.J. Burton,
                                            New York 1975 ).
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variables:      constr(1), constr(2), constr(3), constr(4)
      
      Description:    These variables have different meanings
                                            for different constraint types:
                      
                                           'type_coord' : constr(1) is the first index of the
                                                          atomic type involved
                                                          constr(2) is the second index of the
                                                          atomic type involved
                                                          constr(3) is the cut-off radius for
                                                          estimating the coordination
                                                          constr(4) is a smoothing parameter
                      
                                           'atom_coord' : constr(1) is the atom index of the
                                                          atom with constrained coordination
                                                          constr(2) is the index of the atomic
                                                          type involved in the coordination
                                                          constr(3) is the cut-off radius for
                                                          estimating the coordination
                                                          constr(4) is a smoothing parameter
                      
                                             'distance' : atoms indices object of the
                                                          constraint, as they appear in
                                                          the 'ATOMIC_POSITION' CARD
                      
                      'planar_angle', 'torsional_angle' : atoms indices object of the
                                                          constraint, as they appear in the
                                                          'ATOMIC_POSITION' CARD (beware the
                                                          order)
                      
                                         'bennett_proj' : constr(1) is the index of the atom
                                                          whose position is constrained.
                                                          constr(2:4) are the three coordinates
                                                          of the vector that specifies the
                                                          constraint direction.
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variable:       constr_target
      
      Type:           REAL
      Description:    Target for the constrain ( angles are specified in degrees ).
                      This variable is optional.
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: OCCUPATIONS 

   OPTIONAL CARD, USED ONLY IF OCCUPATIONS = 'FROM_INPUT', IGNORED OTHERWISE !
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      OCCUPATIONS 
           f_inp1(1)  f_inp1(2)  . . .  f_inp1(nbnd)  
         [ f_inp2(1)  f_inp2(2)  . . .  f_inp2(nbnd)  ] 
         
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Variable:       f_inp1
      
      Type:           REAL
      Description:    Occupations of individual states (MAX 10 PER LINE).
                      For spin-polarized calculations, these are majority spin states.
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variable:       f_inp2
      
      Type:           REAL
      Description:    Occupations of minority spin states (MAX 10 PER LINE)
                      To be specified only for spin-polarized calculations.
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: ATOMIC_FORCES 

   OPTIONAL CARD USED TO SPECIFY EXTERNAL FORCES ACTING ON ATOMS
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      ATOMIC_FORCES 
         X(1)    fx(1)    fy(1)    fz(1)    
         X(2)    fx(2)    fy(2)    fz(2)    
         . . . 
         X(nat)  fx(nat)  fy(nat)  fz(nat)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Variable:       X
      
      Type:           CHARACTER
      Description:    label of the atom as specified in ATOMIC_SPECIES
      +--------------------------------------------------------------------
      
      +--------------------------------------------------------------------
      Variables:      fx, fy, fz
      
      Type:           REAL
      Description:    external force on atom X (cartesian components, Ha/a.u. units)
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: PLOT_WANNIER 

   OPTIONAL CARD, INDICES OF THE STATES THAT HAVE TO BE PRINTED (ONLY FOR CALF=1 AND CALF=5).
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      PLOT_WANNIER 
         iwf(1)    
         iwf(2)    
         . . . 
         iwf(nwf)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Variable:       iwf
      
      Type:           INTEGER
      Description:    These are the indices of the states that you want to output.
                      Also used with calwf = 1 and 5. If calwf = 1, then you need
                      nwf indices here (each in a new line). If CALWF=5, then just
                      one index in needed.
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


========================================================================
CARD: AUTOPILOT 

   OPTIONAL CARD, CHANGES SOME VARIABLES ON THE FLY OF THE CALCULATION.
   
   NOTICE THAT THE RULES HAS TO BE ORDERED IN WITH TIME STEP AND THE CARD HAS
   TO BE TERMINATED WITH "ENDRULES"
   
   /////////////////////////////////////////
   // Syntax:                             //
   /////////////////////////////////////////
   
      AUTOPILOT 
         pilot_rule(1)       
         pilot_rule(2)       
         . . . 
         pilot_rule(nevent)  
   
   /////////////////////////////////////////
   
   DESCRIPTION OF ITEMS:
   
      +--------------------------------------------------------------------
      Variable:       pilot_rule
      
      Type:           RULE
      Description:    To set up a rule, one can add the scheduled steps with on_step and
                      separate the corresponding change in parameters with a column.
                      
                      See a simple example bellow:
                      
                      AUTOPILOT
                          on_step =  31  : dt               = 5.0
                          on_step =  91  : iprint           = 100
                          on_step =  91  : isave            = 100
                          on_step = 191  : ion_dynamics     = 'damp'
                          on_step = 191  : electron_damping = 0.00
                          on_step = 691  : ion_temperature  = 'nose'
                          on_step = 691  : tempw            = 150.0
                      ENDRULES
      +--------------------------------------------------------------------
      
===END OF CARD==========================================================


This file has been created by helpdoc utility on Fri Mar 03 06:55:20 UTC 2017