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Application of the advanced adiabatic approach to charge exchange in slow collisions of H and $O^{8+}$

Richter, Klaus and Solov'ev, E. (1993) Application of the advanced adiabatic approach to charge exchange in slow collisions of H and $O^{8+}$ . Physical Review A (PRA) 48 (1), pp. 432-441.

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Other URL: http://link.aps.org/abstract/PRA/v48/p432

Abstract

We study charge exchange in slow atomic collisions within the framework of the advanced adiabatic approach [Grozdanov and Solov'ev, Phys. Rev. A ${\it 42}$ , 2703 (1990)]. In this approach, nonadiabatic transitions near hidden or avoided crossings are related to branch points connecting adiabatic potential curves at complex values of the internuclear distance. A program package has been developed that automatically takes into account all relevant nonadiabatic transition amplitudes for the calculation of charge-transfer cross sections. The present method allows the inclusion of a large number of molecular-orbital basis functions and turns out to be extremely fast. As an example, partial and total cross sections are calculated for charge exchange in slow O $^{8+}$ +H(1 ${\it s}$ ) collisions. The results are compared to previous theoretical and experimental data.