Classical trajectory study of orientation and alignment effects for charge exchange processes in H+-Na*(3p(m)) collisions

The orientation and alignment effects for charge exchange in H+ + Na*(3p) collisions are studied using the classical trajectory Monte-Carlo method in the energy range from 1 to 8keV. For Na*(3p(-1)) --> H*(2s,2p(+/-1)) transitions a large orientation effect is predicted by the probability functions, in very good agreement with semiclassical calculations. Angular differential cross sections are also calculated and interpreted using the impact parameter dependence of the proton deflection angle. They predict left-right asymmetry in agreement with semiclassical calculations or experimental results, but slightly smaller. Another geometry, not experimentally realized, is considered, where the proton velocity is parallel to the quantization axis of the p(+/-1) oriented states. Charge exchange from different aligned states with respect to the direction of the projectile velocity is also investigated, but the alignment effects are not as well desscribed as the orientation effects. Total cross sections from oriented or aligned states with cylindrical symmetry around the projectile velocity direction are calculated and allow the hypothesis of velocity matching to be tested.