Abstract
Low-energy (10-keV) recoil scattering is proposed as a tool for measurement of adsorbate positions on monocrystalline surfaces. This technique, which makes use of high-energy-recoil adsorbate atoms (energy \ensuremath{\ge} 1 keV), supplies real-space structure information. Its potentialities are illustrated in a study of the adsorption system H on (111) sites of Pt. By exploiting surface channeling of incident 10-keV Ne ions on vicinal Pt surfaces we show unambiguously that H occupies fcc-type adsorption sites on Pt(111) terraces.
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