Asymptotic theory of the one- and two-electron processes in slow collisions of atomic ions with diatomic molecules

Abstract

We apply the asymptotic method and a semiclassical coupled-channel approach to study the one- and two-electronic processes occurring in the course of slow collisions between multiply charged atomic ion and diatomic molecules with two active electrons. The matrix elements responsible for different processes of single and double electron transfer are calculated asymptotically correctly (for large distances $R$ between interacting particles) in the framework of the nonperturbative Landau-Herring approach. The methods are applied for study of single and double electron transfer in ${\text{H}}_{2}+{\text{He}}^{2+}$ collisions at impact energies 0.1--30 keV/amu. Our calculations are in fairly good agreement with available experimental data and theoretical calculations of other authors.