Abstract
The energy dependence of the total cross section for electron scattering by methane and its chloride compounds has been studied by considering the latest experimental results and those predicted by the Born-Bethe theory. A simple analytical expression depending on the number of electrons and the polarizability of the target is proposed for these molecules. The energy dependence given by this formula shows an asymptotic behavior for increasing energy in better agreement with the Born-Bethe theory. The inconsistency with the Born-Bethe theory of the two-parameter formula given recently by Karwasz et al. has also been shown.
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