DISTORTED-WAVE MODELS FOR ELECTRON-CAPTURE IN ASYMMETRIC COLLISIONS

We study the single electron capture process by impact of bare ions on hydrogen-like atoms, at intermediate and high collision energies. The theoretical analysis is carried out within the impact parameter appro ximation, by using distorted wave models. We present a prior version o f the scattering amplitude: the Continuum Distorted Wave-Eikonal Final State approximation. Post-prior discrepancies are studied, by compari son of total cross sections calculated with this model and with the Co ntinuum Distorted Wave-Eikonal Initial State approximation. We introdu ce a single prescription to select the model that should be employed, according to the asymmetric character of the collision system. This pr escription also considers the case of symmetric collisions. Capture to selective final states and to any final state, by impact of H+, He2and Li3+ projectiles on H(ls) targets is analyzed. Comparisons with ex perimental data and with Continuum Distorted Wave and Symmetric Eikona l theoretical predictions are given.