Anharmonic damping in rare-gas multilayers

Journal Article · Fri Sep 15 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.6326· OSTI ID:5525701

Hall, B; Mills, D L ^[1]; Zeppenfeld, P; Kern, K; Becher, U; Comsa, G ^[2]

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1. Department of Physics and The Institute for Surface and Interface Science, University of California, Irvine, Irvine, California 92717 (US)
2. Institut fur Grenzflachenforschung und Vakuumphysik, Kernforschungsanlage Julich, Postfach 1913, D-5170 Julich, West Germany

We have calculated the linewidths from anharmonic damping, for the phonon modes of rare-gas bilayers and trilayers adsorbed on the Pt(111) surface. This is done through use of perturbation theory, which in lowest order provides no damping for the monolayer vibration polarized normal to the surface. We also assume that the source of anharmonicity is the lateral interactions between adsorbates. We find linewidths in the range 0.1--0.2 meV at the temperature {ital T}=25 K for all cases studied, save for the Ar bilayer, which is found to be more heavily damped. The results, supplemented by inclusion of radiative damping produced by coupling to substrate phonons, are compared with new experimental results for both the linewidth and dispersion of the normal modes of Ar, Kr, and Xe monolayers, bilayers, and trilayers adsorbed on the Pt(111) surface. The theoretical and experimental results are in good accord.

• OSTI ID: 5525701
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 39:9; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ADSORPTION
ARGON
BRILLOUIN ZONES
CRYSTAL FACES
ELEMENTS
FLUIDS
GASES
KRYPTON
LATTICE VIBRATIONS
LAYERS
LINE WIDTHS
METALS
NONMETALS
PERTURBATION THEORY
PHONONS
PLATINUM
PLATINUM METALS
QUASI PARTICLES
RARE GASES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS
XENON
ZONES