Abstract

Inelastic neutron scattering studies of excitations in {sup 36}Ar solid monolayers show a large thermal broadening of the scattered intensity between {ital T}=4 and 45 K. We find this thermal broadening can be readily explained in terms of anharmonic interactions between the phonons in the monolayers. The phonon energies and lifetimes, calculated using the self-consistent phonon theory, are also very sensitive to the nearest-neighbor spacing {ital a}{sub NN} as well as temperature. For {ital a}{sub NN}{approx gt}3.98 A, the floating monolayer is predicted to be mechanically unstable to vibration.

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