CLASSICAL TRAJECTORY STUDY OF ORIENTATION AND ALIGNMENT EFFECTS FOR CHARGE-EXCHANGE PROCESSES IN H-NA-ASTERISK(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,2 p(+/-1)) transitions a large orientation effect is predicted by the pr obability functions, in very good agreement with semiclassical calcula tions. Angular differential cross sections are also calculated and int erpreted using the impact parameter dependence of the proton deflectio n angle. They predict left-right asymmetry in agreement with semiclass ical calculations or experimental results, but slightly smaller. Anoth er geometry, not experimentally realized, is considered, where the pro ton velocity is parallel to the quantization axis of the p(+/-1) orien ted 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 e ffects. Total cross sections from oriented or aligned states with cyli ndrical symmetry around the projectile velocity direction are calculat ed and allow the hypothesis of velocity matching to be tested.