Abstract
Energy losses of reflected Ar+ ions are measured when 15-keV Arq+ (q=1–3) ions are incident on a KCl(001) surface at a grazing angle θi. The observed energy loss for Ar+ incidence increases almost linearly with θi from ∼10 eV at θi=10 mrad to ∼200 eV at θi=50 mrad. The energy losses for Ar2+ and Ar3+ incidence show the similar θi-dependence, but the energy loss is larger than that of Ar+ by ∼25 and ∼40 eV for Ar2+ and Ar3+, respectively. The position-dependent stopping powers were derived from the observed energy losses. The obtained stopping power is almost independent of the incident charge at a distance x smaller than ∼1.5 Å, while the stopping power increases with q at x≳ 1.5 Å. This indicates that the critical distance for charge exchange is ∼1.5 Å in the present case.
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