Classical study of single-electron capture and ionization processes in A(q+)+(H,H-2) collisions

Using a classical method, cross sections in A(q+) + (H, H-2) (q = 1,...,8) collisions are obtained for impact energy ranges 9 keV amu(-1)-6.4 MeV amu( -1) (ionization), -600 KeV amu(-1) (electron capture). For bare ion impact on H, comparison to experiment and to the results of accurate semiclassical calculations shows that total and partial cross sections, as well as trans ition probabilities, obtained with the classical trajectory Monte Carlo app roach, are more accurate than usually assumed. From the characteristics of the mechanisms, we are led to use our data as estimates for the case of dre ssed-ion impact at the higher nuclear velocities. We successfully apply a v ery simple model for H-2 targets, in which the relevant quantities are the charge,of the projectile and the vertical ionization potential of the molec ule. For practical purposes, we give scaling laws to benchmark (H+, He2+) c ases, and for ionization we relate them, at higher nu, to the behavior of t he transition probabilities. [S1050-2947(99)05811-4].