par Loreau, Jérôme 
;Ryabchenko, Sergey ;Muñoz Burgos, J.M.;Vaeck, Nathalie
Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 51, page (085205)
Publication Publié, 2018
;Ryabchenko, Sergey ;Muñoz Burgos, J.M.;Vaeck, Nathalie Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 51, page (085205)
Publication Publié, 2018
Article révisé par les pairs
| Résumé : | The charge transfer process in collisions of excited (n = 2, 3) hydrogen atoms with He+ and in collisions of excited helium atoms with H+ is studied theoretically. A combination of a fully quantum-mechanical method and a semi-classical approach is employed to calculate the charge-exchange cross sections at collision energies from 0.1 eV u-1 up to 1 keV u-1. These methods are based on accurate ab initio potential energy curves and non-adiabatic couplings for the molecular ion HeH+. Charge transfer can occur either in singlet or in triplet states, and the differences between the singlet and triplet spin manifolds are discussed. The dependence of the cross section on the quantum numbers n and l of the initial state is demonstrated. The isotope effect on the charge transfer cross sections, arising at low collision energy when H is substituted by D or T, is investigated. Rate coefficients are calculated for all isotopes up to 106 K. Finally, the impact of the present calculations on models of laboratory plasmas is discussed. |
