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- W2044492204 abstract "The problem of abstracting information from vibrational line shapes at metal surfaces has received much theoretical and experimental attention within the last decade. Currently the pathways to vibrational phase relaxation at surfaces thought to contribute the most are (a) coupling to a lower frequency mode in energetic contact with the phonons of the substrate bath—also called the ‘‘exchange mechanism’’, and (b) lateral dipole–dipole interaction between admolecules. The present work advances the understanding of the former contribution, that of the exchange mechanism. It is a comparative study of the line shape due to a novel treatment of the exchange mode dynamics against that due to the usual assumption of the energy diffusion limit model of the exchange mode dynamics. It is found that by allowing for phase relaxation of the lower mode as well as energy relaxation, the line shapes differ in shift and width, and for certain range of coupling strengths (of the high frequency mode to the low frequency mode, of the lower mode to the bath, etc.), the differences can be experimentally discerned. The work also suggests a unified convention for reporting the coupling between the system modes (called δω throughout the body of the paper), and the damping parameter η." @default.
- W2044492204 created "2016-06-24" @default.
- W2044492204 creator A5068167821 @default.
- W2044492204 date "1988-03-01" @default.
- W2044492204 modified "2023-09-30" @default.
- W2044492204 title "The effect of the exchange mode dynamics on vibrational phase relaxation at surfaces" @default.
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- W2044492204 doi "https://doi.org/10.1063/1.453986" @default.
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