Radiative charge transfer in collisions of O with He+

Radiative charge transfer has been investigated for collisions of O with He+ with both a fully quantum mechanical theory and an optical potential method. Cross sections and rate coefficients are presented for the process O(P-3) + He+ --> O+(S-4(o), P-2(o),D-2(o)) + He + kw and are compared to those of direct charge transfer. The relative collision energies considered range from 0.1 meV to similar to3 eV with a semiclassical extension to 10 keV and temperatures between 10 and 2.0 x 10(6) K. The results demonstrate that radiative charge transfer is the dominant process over the energy and temperature region considered. Total emission spectra for the two strongest of the ten possible transitions are given for several collision energies, and the origin of resonance-like structures in the spectra is discussed.