Skipping motion of 30 keV H ions on single crystal surface of KCl

The angular distributions and the energy spectra of scattered H⁺ ions are studied at glancing angle incidence of 30 keV H⁺ ions on the (001) surface of KCl single crystal. Discrete energy loss spectra of the scattered ions are observed. The observed exit angle distributions of the ions which have lost anomalous large amounts of energy at various angles of incidence do not depend on the angle of incidence. From the observed results, it is concluded that skipping motion occurs on the surface of KCl.