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Methods for the evaluation of internal energy distribution functions resulting in ions from impact of energetic electrons are examined and their shortcomings are analyzed. It is shown that energy-deposition functions can be estimated from photoelectron spectra and photoionization cross sections if the Bethe—Born treatment of collisions is employed, but allowance for autoionization and multiple ionization processes is not possible. Deposition functions are calculated for methane, ethane, and ethylene. Mass spectra obtained by folding the functions into breakdown graphs are in reasonable agreement with experimental fragmentation patterns for 70−eV electrons.
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Meisels et al. (1972) studied this question.
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