Effect of inelastic scattering on the resonance line shapes in He-graphite

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Abstract
Recent experiments on the scattering of low-energy neutral helium beams from the basal surface of graphite have produced detailed spectra with prominent resonant features characteristic of physisorption of the incident atoms. Elastic calculations of the expected angular spectra show only qualitative agreement, with large discrepancies in both the overall scattered intensity and the widths and, in some cases, the signatures of the resonances. By consistently including a Debye-Waller factor to account for inelastic processes in scattering from the strongly repulsive part of the atom-sruface potential, we obtain calculated spectra in very good agreement with observation, except near grazing incidence.