Angular and charge state distributions of highly charged ions scattered during low energy surface-channeling interactions with Au(110)

摘要

The authors have measured scattered projectile angular and charge state distributions for 3.75 keV/amu O(sup q+) (3 (= or <) q (=or <) 8) and 1.2 keV/amu Ar(sup 1+) (3 (= or <) q (= or <) 14) ions grazingly incident along the (110) and (100) directions of a Au(110) single crystal target. Scattered projectile angular distribution characteristic of surface channeling are observed. For both incident species, the dominant scattered charge fraction is neutral, which varies only by a few percent as a function of incident charge state. Significant O(sup (minus)) formation is observed, which manifests a distinct velocity threshold. For incident Ar projectiles with open L-shells, the positive scattered charge fractions, while always less than about 10%, increase linearly with increasing number of initial L-shell vacancies.