Abstract
The photo-ionization cross section of methane is calculated using self-consistent wave functions. The value at the spectral head (105 850 cm-1) is found to be 9.4×10-17 cm2. An approximate general formula is employed to obtain results in a wave number range up to 200 000 cm-1 and the associated oscillator strength is computed. It is pointed out that exchange effects probably reduce the cross section. With the aid of the general formula an estimate is also made of the photo-ionization cross section of argon.
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