CONTRIBUTION OF INNER-SHELL ELECTRONS TO POSITION-DEPENDENT STOPPING POWERS OF A CRYSTAL-SURFACE

Position-dependent stopping powers of the (001) surface of SnTe single crystal for specularly reflected 15-200 keV H+ ions are studied. The position dependence of the experimental stopping powers varies with th e energy of the ions. From the comparison with the theoretical stoppin g powers based on both the single ion-electron collision and the colle ctive excitation of the valence electrons, it is concluded that the ob served change in the position-dependent stopping powers with the energ y of H+ is due to the variation of the contribution of inner shell ele ctrons to stopping.