Dephasing of Local Vibrations in a Planar Lattice of Adsorbed Molecules

Details Dephasing of Local Vibrations in a Planar Lattice of Adsorbed Molecules Dephasing of Local Vibrations in a Planar Lattice of Adsorbed Molecules

1999-06-18

arxiv.org/abs/cond-mat/9906293v1

Surf.Rev. Lett., V.5, No.5 (1998) 965-970

Physics

Condensed Matter

Materials Science

REVTeX, 11 pages, no figures

Scientific paper

10.1142/S0218625X98001304

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 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.

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