Surface phonon dispersion on Cu(111)
- 15 February 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 37 (5) , 2763-2765
- https://doi.org/10.1103/physrevb.37.2763
Abstract
We report the first experimental determination of surface phonon dispersion on Cu(111) using high-resolution electron-energy-loss spectroscopy. The gap mode () near M¯ in the surface Brillouin zone is measured for the first time in addition to extending earlier He scattering measurements by Toennies and collaborators of the Rayleigh and longitudinal resonance modes. Lattice-dynamical and electron-scattering analysis of these results indicate that the lateral surface force constant is softened by approximately 15% in marked contrast to earlier suggestions that a 50–70% reduction occurs on this surface.
Keywords
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