K- and l-shell resonant transfer and excitation in ion-atom collisions

Abstract

Recent experimental studies of resonant transfer and excitation (RTE) in ion-atom collisions are reviewed. In the RTE process correlated electron capture and projectile excitation occur together in a single encounter with a target atom. Measurements of Ca q+ + H 2 ( q= 10–19) from 100 to 370 MeV establish the projectile charge-state dependence of K-shell RTE and provide a detailed test of the theory. Structure due to RTE is observed in the energy dependence of the total electron-capture cross sections for this collision system. A comparison of the Ca 17++H 2 data with previous results for Ca 17++He demonstrates the effect of the target-electron momentum distribution on the RTE process. Studies of 230–610 MeV Nb 31+ +H 2 provide information about RTE involving projectile L-shell excitation. All the measurements are in reasonable agreement with theoretical calculations.