Molecular-state treatment of electron capture in slow collisions of C4+ with H: Alignment and orientation effects.

Abstract

Total and state-selective charge-transfer cross sections for ${\mathrm{C}}^{4+}$-H collisions have been calculated in the energy range 0.02--1.0 keV/amu by employing the semiclassical, impact-parameter, close-coupling method based on a molecular-state description of the ${\mathrm{CH}}^{4+}$ system and including plane-wave translation factors. The calculated cross sections are in good agreement with the quantum calculations as well as with the experimental findings. The integral alignment (${\mathit{A}}_{20}$) parameter for the ${\mathrm{C}}^{3+}$(3p) state is also presented.