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Dephasing of Local Vibrations in a Planar Lattice of Adsorbed Molecules

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  • V. M. Rozenbaum

    (Institute of surface Chemistry, National Academy of Sciences of Ukraine, Prospect Nauki 31, Kiev 252022, Ukraine)

  • I. V. Kuzmenko

    (Institute of surface Chemistry, National Academy of Sciences of Ukraine, Prospect Nauki 31, Kiev 252022, Ukraine)

Abstract

We investigate anharmonically coupled high- and low-frequency excitations in a planar lattice of adsorbed molecules interacting with phonons of a crystal. Dephasing of high-frequency local vibrations by low-frequency resonance modes is described in terms of the temperature Green's function. The equations obtained are solved, first, with a small ratio of the anharmonic-coupling coefficient for high- and low-frequency modes to the resonance width, and second, in the low-temperature limit. High-frequency spectral-line positions and widths depend on dispersion laws and resonance-mode lifetimes. It is shown that lateral interactions of low-frequency modes of adsorbed molecules can lead to a significant narrowing of high-frequency spectral lines, which is consistent with experimental data.

Suggested Citation

  • V. M. Rozenbaum & I. V. Kuzmenko, 1998. "Dephasing of Local Vibrations in a Planar Lattice of Adsorbed Molecules," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 5(05), pages 965-970.
  • Handle: RePEc:wsi:srlxxx:v:05:y:1998:i:05:n:s0218625x98001304
    DOI: 10.1142/S0218625X98001304
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