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PACS. 79.20N -Atom, molecule, and ion impact. PACS. 34.90 -Other topics in atomic and molecular collision processes and interactions.

Recent Oak Ridge work is summarized on projectile energy gain by image charge acceleration, scattered ion charge distributions, and K-Auger electron emission during low energy grazing interactions of highly charged Pb, I, 0 and Ar ions with a A u (l l 0) surface.

We have measured scattered projectile angular and charge state distributions for 3.75 keV/amu Oq+ (3 1 q 1 8) and 1.2 keV/amu AP' (3 5 q 5 14) ions grazingly incident along the [I101 and I1001 directions of a A u (l l 0) 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 0-formation is observed, which manifests a distinct velocity threshold. For incident A r projectiles with open L-shells, the positive scattered charge fractions, while always less than about IO%, increase linearly with increasing number of initial L-shell vacancies.