Abstract
The recent time-of-flight spectra of 4He scattered from LiF(100) surface measured by Brusdeylins, Doak and Toennies are theoretically analyzed in the framework of the hard corrugated surface approximation and of the breathing shell model for surface dynamics. The observed structures are shown to be associated with Rayleigh waves close to the zone boundary, and with other features of the surface-projected phonon density.
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