The cross section of single-electron capture in slow H- + A(3+) --> H + A(2+)(n) collisions is calculated in the one-electron approximation by using the close coupling approach. It is found that the change of the electronic configuration, that takes place at every avoided crossing of the ionic and covalent energy terms, is a source of nonadiabatic transitions in the system. This effect leads to a substantial increase of the total cross section and produces an effective repopulation of individual covalent states.
Janev, RK., Chibisov, M., & Brouillard, F. (1999). Single electron capture in slow H-+A(3+) collisions. Physica Scripta. Topical Issues, 60(5), 403-406. https://doi.org/10.1238/Physica.Regular.060a00403 (Original work published 1999)