Volume 625, May 2019
|Number of page(s)||7|
|Section||Atomic, molecular, and nuclear data|
|Published online||03 May 2019|
Electron capture in slow collisions of O6+ ions with atomic hydrogen⋆
School of Physics, Beijing Institute of Technology, Beijing 100081, PR China
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, PR China
3 HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100084, PR China
4 Macedonian Academy of Sciences and Arts, PO Box 428, 1000 Skopje, Macedonia
Accepted: 2 March 2019
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.
Key words: solar wind / atomic data
Tables of the cross-sections are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/625/A29
© ESO 2019
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