Radiative and nonradiative charge transfer in collisions of Be2+ and B3+ ions with H atoms

The nonradiative charge-transfer processes in Be2+(1s2)+H(1s) and B3+(1s2)+H(1s) collisions are investigated by the quantal molecular orbital close-coupling method in the energy range of 10-5eV/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 10-5-100 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 Be2+(1s2)+H(1s) collision in the entire eV and sub-eV energy region. In the B3+(1s2)+H(1s) collision case, however, the cross section for radiative decay to 1 2Σ+ and 2 2Σ+ molecular states significantly exceeds that for the nonradiative process for energies below 30 eV/u.