HE-2-H2 COLLISIONS - NONDISSOCIATIVE AND DISSOCIATIVE ONE-ELECTRON CAPTURE()

Electron-redistribution processes in collisions of He-2+ ions on H-2 a re studied for energies from 1 to 25 keV amu-1. One-electron capture a nd target excitation cross sections are determined by photon-emission spectroscopy. At energies exceeding approximately 5 keV amu-1 capture into excited states is the dominant charge-transfer process while at l ower energies one-electron capture into the ground state dominates. Th e latter process is found to be accompanied by dissociation of the tar get and ''citation of the resulting hydrogen atom. This can be explain ed qualitatively with the classical overbarrier model under the assump tion that during the collision binding energy is exchanged between the electrons, which is a kind of auto-excitation process.