Oxidation and ionization

sample

CO2

16O-

oxidizer

Cs sputter

source

12C-

13C-

14C-

13CH-

12CH2-

N-

CuO

750oC

As each compound elutes from the GC,

it’s converted to CO2 by an on-line oxidizer.

The CO2 (and ambient nitrogen)

is converted to negative ions by

bombardment with high-energy Cs ions.

N- is unstable, and decomposes.

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