Ab initio study of charge transfer processes in ion-atom collisions at low to intermediate energies

The single charge transfer process in He+ + H collisions is investigated using the quantum-mechanical molecular-orbital close-coupling method, in which the adiabatic potentials and radial couplings are calculated by using the ab initio multireference single and double-excitation configuration interaction methods. Total and state-selective cross sections for the single charge transfer are presented for incident energy range from 5 eV/u to 15 keV/u for the projectile He+. Obvious discrepancy is found in comparing with the calculations by B. Zygelman et al. in the low-energy range and the charge transfer processes to higher states become more important with increment of the incident energy. (author)