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

Cross sections for charge transfer, neutralization and excitation in II-Il and H--H+ collisions are presented in the energy range 1-30 keV. The semicl assical close-coupling approach is used with a two-centre two-electron atom ic state expansion and frozen total spin. All details of the two-centre ato mic 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 tra nsfer, neutralization and excitation to H(2s) in H-H collisions. Disagreeme nt with previously published close-coupling calculations and experimental d ata is noted, especially for two-electron charge transfer in H--H+.