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Charge transfer in low-energy Al3+-H and Ti4+-H collisions: effect of rotational coupling in three-state crossings

A theoretical investigation of charge transfer in collisions of Al3+ and Ti4+ ions with atomic H is carried out for the energy range 1-1000 eV amu-1. An adiabatic molecular basis set, with the inclusion of appropriate translation factors, is used to describe the collision dynamics. In both the Al3+-H and Ti4+-H systems, the influence of rotational coupling proves to be considerable and depends quite critically on the correlation to the principal electron capture channel of the asymptotic energy splitting of the Sigma and Pi states.