Abstract
A lattice-dynamical study of the inert-gas monolayers of Xe, Kr, Ar, and Ne, in epitaxy with the (0001) graphite surface has been made at different temperatures. The calculation considers an extended version of the anharmonic theory of Dobrzynski and Maradudin for a Bravais lattice. We observe only a small relaxation of monolayer away from the graphite surface in the temperature range 0 K to the melting temperature of the rare-gas solid. The mean-square displacement (MSD) of the inert-gas atoms lying in the plane of the monolayer are, in general, an order of magnitude larger than that of the carbon atoms. The value of the in-plane component of MSD is greater than the out-of-plane component and their difference increases with a decrease in the mass of the adsorbed atom. The calculated values of the MSD's are in reasonable agreement with the available experimental data. No soft phonon appears.
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