Vibronic semiclassical calculations of differential cross sections for excitation and charge transfer in H sup + + O sub 2 collisions

Vibrational excitation and vibronic charge transfer in the H{sup +}+ O{sub 2} collision at E{sub cm} = 23 eV are investigated by using a 2 {times} 15 vibronic expansion in a semiclassical close-coupling approach. Differential cross sections and relative state-to-state probabilities are presented and compared with both results of an earlier quantal infinite-order sudden calculation and experimental data. The overall agreement shown by this triple comparison is most gratifying.