The electron excitation cross sections for He (1s²¹S→2p²³P), Mg (3s²¹S→3p²³P), and Ca (4s²¹S→4p²³P) have been calculated with the use of the Ochkur, Glauber, and a simplified Glauber approximation. The results are compared with the Born-Oppenheimer approximation and, in the case of helium, with available experimental data. The Glauber and simplified Glauber approximations are found to differ significantly from the Born-Oppenheimer approximation, especially in the high-energy limit.
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Williamson et al. (1982) studied this question.
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