An integral form of the close-coupling approximation by Ghosh and Basu (1973) and Chaudhuri at al. (1974) has been employed to investigate the processes e + +He(1s 2 ) to e + +He(2s 2 ) and e + +He(1s 2 ) to (e + e - )+He(1s). Couplings of the excited states of both the helium and positronium atoms have been neglected. Results obtained by using an approximate form of the close-coupling approximation which neglects some strong distortion effects are presented. The results in two-state close-coupling approximation do not show good agreement with the experimental findings below the positronium formation threshold. The effect of exchange of electrons is found to be appreciable in the low-energy region.
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Mandal et al. (1975) studied this question.
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