Channeling effects observed in energy-loss spectra of nitrogen ions scattered off a Pt(110) surface

Abstract

We present measured energy-loss spectra of nitrogen ions, which are scattered off a $(1\ifmmode\times\else\texttimes\fi{}2)$ missing row reconstructed Pt(110) single-crystal surface. The primary energy is varied from below 1 keV up to above 1 MeV, i.e., ${0.04v}_{0}<v<{2v}_{0}$ with ${v}_{0}$ the Bohr velocity. We use grazing angles low enough in order to have surface channeling at all energies. Experimental results are compared with theoretical energy-loss values obtained from trajectory and stopping power calculations of charged particles scattered under grazing incidence conditions from metallic surfaces. The stopping power is calculated using the scattering theory formalism. Different trajectory classes are found by the calculations and assigned to different contributions in the energy-loss spectra. Regarding the simplicity of the presented model the agreement with the experiment is good.