Using high-resolution He-atom scattering, we have measured the thermal attenuation of the specular beam and the variation of the inelastically scattered one-phonon and multiphonon intensities as a function of temperature. A dynamical calculation including transition matrix elements up to third order, and taking into account a strongly enhanced surface anharmonicity, describes both the specular- and the inelastic-scattering data.
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Armand et al. (1989) studied this question.
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