A discrepancy in the analysis of Corinaldesi and Trainor is pointed out, and it is shown that the correct procedure leads to a non-vanishing expression for the exchange scattering amplitude given by the Born-Oppenheimer approximation for excitation of the m = ± 1 levels of the 2p state of atomic hydrogen by electron impact. This expression is employed to correct earlier calculations of 1s-2p excitation total cross section.
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K L Bell (1965) studied this question.
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