Determination of the Surface Phonon Dispersion Relations for Monolayer, Bilayer, Trilayer and Thick Kr(111) Films Physisorbed on Ag(111) by Inelastic He Scattering.
Interim technical rept.,
CHICAGO UNIV IL JAMES FRANCK INST
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Angle and velocity resolved inelastic He scattering has been used to study how the surface dynamics of thin rare gas films evolve on a layer-by-layer basis. Surface phonon dispersion relations for ordered 1,2,3 and 25 layer Kr films physisorbed on Ag111 are presented along TM across the entire Brillouin zone. The monolayer data are dispersionless, indicative of an Einstein oscillator mode. In comparison, the 25 layer film has a well developed Rayleigh wave, typical of a thick crystal surface. Excitation linewidths for monolayer Kr, which vary across the zone, are also briefly discussed. Originator supplied keywords include Surface phonon spectroscopy Gas-surface energy exchange Inelastic single phonon scattering rare gas interaction potentials.
- Solid State Physics