Abstract
High resolution helium atom scattering has been used to study the structure and phonons of the (√3 × √3)R30° commensurate lattice of a monolayer of xenon on Pt(111). For in-plane vibrations, the data indicate a Brillouin zone-centre gap of about 1.3 meV and a dispersion of less than 0.5 meV from the Brillouin zone centre to the zone edge along the azimuth of the Xe solid, the Pt(111) direction. The data are consistent with a model of top-site adsorption of the Xe and with lateral Xe-Xe interactions being the same as in the gas phase.
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