Vibrationally resolved charge transfer for proton collisions with CO and H collisions withCO+

Abstract

Electron capture by protons following collisions with carbon monoxide, and the reverse process, is studied with a quantal molecular-orbital coupled-channel method utilizing the infinite order sudden approximation for collision energies between 0.5 and $1000\phantom{\rule{0.3em}{0ex}}\mathrm{eV}∕\mathrm{u}$. The potential surfaces and couplings, computed with the multireference single- and double-excitation method for a range of ${\mathrm{H}}^{+}\text{\ensuremath{-}}\mathrm{C}\mathrm{O}$ orientation angles and C-O separations, are adopted in the scattering calculations. Results including vibrationally resolved and orientation-angle-dependent cross sections are presented for a range of CO and $\mathrm{C}{\mathrm{O}}^{+}$ vibrational levels. Comparison with experiment is made where possible and the relevance of the reaction in astrophysics and atmospheric physics is discussed.