OBSERVATION OF SKIPPING MOTION AND SUBSURFACE PLANAR CHANNELING OF 30KEV H-CRYSTAL SURFACES( IONS ON SINGLE)

The angular distributions and the energy spectra of scattered H+ ions at glancing angle incidence of 30 keV H+ ions on the (001) surfaces of KCl and SnTe single crystals are studied. It is concluded from the re sults that skipping motion of the ions occurs on the smooth surface of KCl, while subsurface planar channeling of the ions penetrating the s urface at surface steps occurs on the rough surface of SnTe. On the sm ooth surface of SnTe, both skipping motion and subsurface planar chann eling occur. From the angular distributions of the ions which have los t anomalous large energies at various angles of incidence it is possib le to distinguish the skipping motion in which the distributions do no t depend on the angle of incidence from the subsurface planar channeli ng in which the distributions depend on the angle of incidence.