Surface science lettersInelastic effect on the resonance lineshapes in he-graphite scattering

A multiple Debye—Waller effect for bound state resonances in atom scattering was recently proposed to explain the observed width and strength of measured resonances. The model was applied with success to measurement of the specular intensity for He-graphite at low incident energies, and to measurement of the diffracted intensities for D-LiF(001) at grazing incidence. We present new calculations for He-graphite at intermediate incident energy, by which the multiple Debye-Waller attenuation appears completely inadequate to describe experimental the inelastic effect on the resonance lineshapes.