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A second Born calculation of the (e, 2e) triple differential cross section for excitation-ionization of helium to He + ( n = 2) in coplanar asymmetric geometry is found to be in excellent agreement with recent (relative) measurements of Rouvellou et al (Rouvellou B, Rioual S, Pochat A, Tweed R J, Langlois J, Nguyen Vien G and Robaux O 2000 J. Phys. B: At. Mol. Opt. Phys. 33 L599 ). The second Born cross section is very much larger, by about a factor of four, than the corresponding first Born cross section, a trend that is consistent with absolute total cross section measurements for ionization to He + (2p) at the same impact energy.
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Marchalant et al. (2000) studied this question.
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