Rayleigh wave dispersion on Ag(100) along the 〈100〉 direction
- 15 June 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 41 (18), 12905-12907
- https://doi.org/10.1103/physrevb.41.12905
Abstract
Electron-energy-loss-spectroscopy measurements of Rayleigh phonon dispersion are reported for the Γ¯-M¯ direction of the Ag(100) surface. The data are compared to lattice-dynamical calculations performed within a nearest-neighbor model. The comparison shows that a slight increase of the force constant between the first and second layer with respect to the bulk value is needed in order to fit the data. The force-constant change is, however, less than the accuracy with which one can reproduce the bulk phonon spectrum with this model and is therefore not physically significant. More sophisticated models are, on the other hand, shown to give wrong predictions for the surface spectrum. We conclude therefore that the Ag(100) surface exhibits smaller effects of surface relaxation, if indeed there are any effects, than the same surfaces of Cu and Ni.Keywords
This publication has 11 references indexed in Scilit:
- The phonon spectrum of Ag(100) in theSurface Science, 1989
- EELS study of the dynamics of clean Ni(100): Surface phonons and surface resonancesSurface Science, 1986
- The Rayleigh phonon dispersion on Cu(100): A stress induced frequency shift?Zeitschrift für Physik B Condensed Matter, 1986
- Atom vibrations on the (111) and (100) surfaces of gold, nickel, and silverPhysical Review B, 1984
- Surface vibrations on face centered cubic metal surfaces: the (111) surfacesSurface Science, 1983
- Anomalous Surface Phonon Dispersion Relations for Ag(111) Measured by Inelastic Scattering of He AtomsPhysical Review Letters, 1983
- Surface Phonon Dispersion of Ni(100) Measured by Inelastic Electron ScatteringPhysical Review Letters, 1983
- Surface vibrations on body centered cubic and face centered cubic metal surfaces: The (100) surfacesSurface Science, 1982
- Surface phonons and superstructures: An application: transition metalsSurface Science, 1976
- Studies of Vibrational Surface Modes. I. General FormulationPhysical Review B, 1971