Resonances in the surface-phonon spectrum of an sp-bonded metal

Helium-atom time-of-flight measurements, and microscopic calculations of surface-phonon spectral densities and dispersion curves are reported, revealing the presence of "anomalous" resonances in the phonon spectrum for low-index surfaces of Al. These resonances are similar to those observe...

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Bibliographic Details
Published in:Physical review letters 1991-01, Vol.66 (3), p.337-340
Main Authors: GASPAR, J. A, EGUILUZ, A. G, GESTER, M, LOCK, A, TOENNIES, J. P
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:Helium-atom time-of-flight measurements, and microscopic calculations of surface-phonon spectral densities and dispersion curves are reported, revealing the presence of "anomalous" resonances in the phonon spectrum for low-index surfaces of Al. These resonances are similar to those observed in d-electron metals, for which they have been attributed to sp--d hybridization effects. For sp-bonded Al, the resonances are not related to a "softening" of a single force constant, but rather to cumulative effects of changes in the entire surface force field. Spectra, Graphs. 25 ref.--AA(US).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.66.337