Abstract
By using an atom-surface scattering apparatus which takes advantage of the use of liquid helium temperatures, the scattering of nearly monoenergetic He, Ne and H2 from the cleaved (001) surface of LiF has been studied with good angular resolution and sensitivity. Owing to the low temperature surface (10 K for He and 80 K for Ne and H2), elastic diffraction peaks were resolved up to high order. The observed elastic diffraction patterns are qualitatively explained by the quantum theory of surface rainbow developed by Levi et al. In the case of H2 scattering, inelastic peaks related to energy exchange between translational and rotational motion of the incident particle are observed and discussed.
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