Low-energy electron capture in collisions ofC3+with He

Abstract

Charge transfer processes due to collisions of ground-state ${\text{C}}^{3+}(1{s}^{2}2s\text{ }^{2}S)$ ions with He atoms are studied using the quantum-mechanical molecular-orbital close-coupling method for energies in the range ${10}^{\ensuremath{-}4}--2\ifmmode\times\else\texttimes\fi{}{10}^{3}\text{ }\text{eV}/\text{u}$. The ab initio adiabatic potentials and radial couplings utilized in the calculations are obtained from the multireference single- and double-excitation configuration interaction approach. Total and state-selective single-electron capture cross sections and rate coefficients are calculated and compared with the available experimental and theoretical data. A good agreement is found between the measured cross sections and the present calculations. However, the previous calculations of total rate coefficients using the Landau-Zener model are one to two orders of magnitude smaller than the present results.