Abstract
We evaluate the surface phonon dispersion relations of Ag(111) and Au(111) within a force constants parametrization of the bułk dynamics. By changing the surface force constants we are able to explain all the salient features appearing in the experimental time of flight spectra of a 7.9 meV He beam. The parallel momentum Q has been considered along the [11̄0] and [112̄] directions of the surface Brillouin ozne. We show that the peaks of the time of flight spectra are related to the Rayleigh wave, to the pseudo Rayleigh wave and to a new resonance of longitudinal character.
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