We report a theoretical study of excitation, charge transfer and ionization in collisions between helium ions He + and atomic hydrogen in the impact energy range between 2.5 and 250 keV amu -1 . The colliding system was treated in a full two-electron formulation as well as in a pseudo-one-electron approximation to the total Hamiltonian. The wavefunctions were expanded in terms of two-centre atomic orbital bases within the semiclassical impact parameter close-coupling method. The results demonstrate advantages and limitations of either approach and allow a detailed comparison to be made with a wide range of available experimental data.
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Ermolaev et al. (1994) studied this question.