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Proceedings Paper

Vibrational Energy Relaxation Of Adsorbates On Surfaces
Author(s): E. J. Heilweil; M. P. Casassa; R. R. Cavanagh; J. C. Stephenson
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Paper Abstract

Picosecond infrared transient bleaching experiments have been performed to measure the population lifetime (T1) of vibrationally excited (v=1) functional groups chemisorbed on high surface area colloidal silicas (SiO2). The experimental method and results for vibrational modes of -OH, -OD, -NH2 and -OCH3 coordinated to surface silicon atoms and for the -BOH surface species are presented. Lifetimes for these groups at both vacuum and liquid interfaces indicate that the adsorbate degrees of freedom, chemical coordination and nearby substrate modes play an important role in damping vibrational energy. It is also surmised that the vibrational lifetime, especially that for the hydroxyl group (T1=150 ps), is related to the chemical reactivity of adsorbates on surfaces.

Paper Details

Date Published: 2 April 1985
PDF: 5 pages
Proc. SPIE 0533, Ultrashort Pulse Spectroscopy and Applications, (2 April 1985); doi: 10.1117/12.946534
Show Author Affiliations
E. J. Heilweil, National Bureau of Standards (United States)
M. P. Casassa, National Bureau of Standards (United States)
R. R. Cavanagh, National Bureau of Standards (United States)
J. C. Stephenson, National Bureau of Standards (United States)


Published in SPIE Proceedings Vol. 0533:
Ultrashort Pulse Spectroscopy and Applications
M. J. Soileau, Editor(s)

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