Abstract
Energy spectra of 2-MeV Cq+ ions incident under glancing angles (3-8 mrad) on step-rich SnTe(001) surfaces are measured at various scattering angles. While the spectrum, observed at the angle of specular reflection, shows a well defined peak corresponding to the ions reflected from the surface without influence of the surface steps, the spectrum, observed at a scattering angle smaller than the specular angle, shows an extra peak of small energy loss. This extra peak is found to correspond to the ions scattered at down steps. This feature allows a direct measurement of the charge state distribution of the ions in the vicinity of the surface. The observed mean charge, 3.49 ± 0.05, in the vicinity of the surface is slightly smaller than the mean charge, 3.67 ± 0.07, for the ions observed at the specular angle. This difference can be explained in terms of velocity matching of the 2-MeV C ions and the N-shell electrons of SnTe.
Published Version
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