Abstract
A method for calculating the ion-material interaction in which the amplitude of the process of single-electron capture is expressed in terms of an elementary function is proposed. A monopole approximation for heavy particle interaction is used without considering the effect of passive electrons of the target atom. For the cross section of the single-electron capture in He+ ion-atom collisions, the proposed method makes it possible to improve the agreement of the calculated results with the experimental data by one order of magnitude in comparison with the OBK approximation.
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