Electron capture in slow collisions of O6+ ions with atomic hydrogen

Aims: Electron capture in collisions of highly charged O⁶⁺ ions with ground-state hydrogen atoms is a very important process in solar wind X-ray studies.
Methods: In the present study, the full quantum-mechanical molecular-orbital close-coupling method is employed to study electron capture reactions in collisions of O⁶⁺ ion with ground-state atomic hydrogen in the energy region from 10^-4 keV u^-1 to 5 keV u^-1. The ab initio multi-reference single- and double-excitation configuration interaction (MRD-CI) method is used to calculate the potential and coupling data used in the QMOCC calculations.
Results: Total and state-selective cross sections for the dominant and subdominant reaction channels are calculated and compared with the available experimental and theoretical data. The branching ratios for Lithium-like O⁵⁺ excited ions are used to calculate the contribution of cascade radiative transitions from n = 5 levels to the population of 4l states. From the calculated cross sections, reaction rate coefficients are obtained for temperatures between 1000 and 1 × 10⁹ K and compared with other calculations.

Tables of the cross-sections are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/625/A29