Wave functions determined by the variational methods of Hulthén and Kohn are employed in the calculation of the zero order partial cross section for the process He + (1s) + e → He + (2s) + e by the distorted wave, the Born and the Oppenheimer approximations. The inadequacy of the latter approximation near the threshold is disclosed.
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Bransden et al. (1953) studied this question.
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