Radiative and nonradiative charge transfer in collisions ofBe2+andB3+ions with H atoms

Abstract

The nonradiative charge-transfer processes in Be{sup 2+}(1s{sup 2})+H(1s) and B{sup 3+}(1s{sup 2})+H(1s) collisions are investigated by the quantal molecular orbital close-coupling method in the energy range of 10{sup -5}eV/u-10 keV/u and by the two-center atomic-orbital close-coupling method in the energy range of 0.1-100 keV/u. The radiative charge-transfer cross sections are calculated by using the optical potential and semiclassical methods in the energy range 10{sup -5}-100 eV/u. For both collision systems, the nonradiative charge-transfer cross sections in the low-energy region show an increasing behavior with decreasing energy. The nonradiative process is the dominant charge-transfer process in the Be{sup 2+}(1s{sup 2})+H(1s) collision in the entire eV and sub-eV energy region. In the B{sup 3+}(1s{sup 2})+H(1s) collision case, however, the cross section for radiative decay to 1 {sup 2{Sigma}+} and 2 {sup 2{Sigma}+} molecular states significantly exceeds that for the nonradiative process for energies below 30 eV/u.