Neutralization and charge transfer in H+-H- and H-H collisions

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Cross sections for charge transfer, neutralization and excitation in H-H and H--H+ collisions are presented in the energy range 1-30 keV. The semiclassical close-coupling approach is used with a two-centre two-electron atomic state expansion and frozen total spin. All details of the two-centre atomic state expansion scheme are given. The basis is expanded onto the bound state of H- and the two-centre H(1s)-H(nlm) states, where n covers the K, L and M shells. A good agreement with experiments is achieved for charge transfer, neutralization and excitation to H(2s) in H-H collisions. Disagreement with previously published close-coupling calculations and experimental data is noted, especially for two-electron charge transfer in H--H+.