Final-state interaction description of the autoionization of atoms by ion impact in the velocity matching regime

摘要

The line profile of the electron emitted in the autoionization of an atom by ion impact is strongly affected by the post-collision interaction (PCI) with the outgoing projectile. Here we analyze how these PCI effects are modified when the projectile velocity is in the close vicinity of the resonant electron velocity. In this energy range, the analysis of the resonance contribution is hindered by the characteristic 'electron capture to the continuum' divergence in the direct term. Here we present a theoretical study of the interplay between both contributions, based on a generalization of the final-state interaction model.