Three-dimensional visible spectroscopy Daniel B. Turner, Katherine W. Stone, Kenan Gundogdu, and Keith A. Nelson The Nelson group has developed a spectrometer capable of measuring three-dimensional electronic (visible) spectra. The 3D spectral solids created by the spectrometer contain more information than 1D and 2D spectra, in this case providing insights about the ultrafast dynamics of excitons—bound electron-hole pairs with Hydrogen-like wavefunctions—in GaAs quantum wells. The results show how pairs of excitons form weakly bound, Helium-like states that play important roles in optical gain and other phenomena of fundamental and practical interest in quantum wells and quantum dots. J. Chem. Phys. 131, 144510 (2009) Highlighted in Physics Today, 17–20 (Nov. 2009) See also Science 324, 1169–1173 (2009) More Chemistry Department News Highlights>>