Theoretical investigation of the electron capture in collisions of O8+ ion with H and He atoms: Comparison between the Landau–Zener and the over-barrier models

Abstract

Analytical and semi-analytical theories based on the molecular and classical treatments have been applied for electron capture processes in collisions of hydrogen and helium atoms with low energy (E=0.1,…,10 keV/amu) O8+ bare ion impact. The used Landau–Zener model (LZ), which allows to give analytical formulas for the cross-sections in our recent approach and the modified over-barrier model (OBM) [Phys. Rev. A 62 (2000) 042711] are briefly summarized. The obtained values of the LZ and OBM cross-sections are compared with experimental data and the results of other sophisticated numerical calculations. It is found that the LZ model provides much reliable cross-sections for charge transfer than the OBM model.