Abstract
Charge transfer due to collisions of ground-stateS4+(3s2 1S) ions with helium is investigated for energiesbetween 0.1 meV u-1 and 10 MeV u-1. Total and state-selective singleelectron capture (SEC) cross sections and rate coefficients areobtained utilizing the quantum mechanical molecular-orbitalclose-coupling (MOCC), atomic-orbital close-coupling (AOCC),classical trajectory Monte Carlo (CTMC) and continuum distorted wavemethods. The MOCC calculations utilize ab initio adiabaticpotentials and nonadiabatic radial coupling matrix elements obtainedwith the spin-coupled valence-bond approach. Previous data arelimited to a calculation of the total SEC rate coefficient using theLandau-Zener model that is, in comparison to the results presentedhere, three orders of magnitude smaller. The MOCC SEC cross sectionsat low energy reveal a multichannel interference effect. True doublecapture is also investigated with the AOCC and CTMC approaches whileautoionizing double capture and transfer ionization (TI) is exploredwith CTMC. SEC is found to be the dominant process except forE>200 keV u-1 when TI becomes the primary capture channel.Astrophysical implications are briefly discussed.
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