We have used the R -matrix with pseudostates method to calculate angle-integrated cross-sections for electron-impact ionization of the n = 2 states in helium. Good agreement with the convergent close-coupling results of Fursa and Bray ( J. Phys. B: At. Mol. Opt. Phys. 30 (1997) 757 ) is obtained, thereby confirming the discrepancy with the experimental data of Dixon et al ( J. Phys. B: At. Mol. Phys. 9 (1976) 2617 ).
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Klaus Bartschat (2002) studied this question.
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