Dephasing of Local Vibrations in a Planar Lattice of Adsorbed Molecules

V. M. Rozenbaum and I. V. Kuzmenko
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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

Surface Review and Letters (SRL), 1998, vol. 05, issue 05, 965-970

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.

Date: 1998
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DOI: 10.1142/S0218625X98001304

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