Stripping and excitation in collisions between p and He^+(n<or=3) calculated by a quantum time-dependent approach with semiclassical trajectories (13 pages)

Stripping and excitation cross sections are calculated, using a time-dependent discrete-variable approach, for collisions of protons with energies from 0.5 keV to 2 MeV with He + initially in the 1s, 2s, 2p, 3s, 3p, and 3dstates. This quantum-semiclassical approach takes trajectory curvature into account. The spatial and temporal convergence properties of the method are analyzed for the ground and higher states. The results are in good agreement with existing accurate calculations and experimental cross sections, available for E p ≥3.73 keV. Results are also obtained for lower-energy collisions where the cross sections are still significant but trajectory curvature is important.