Vibrational Energy Relaxation Of Adsorbates On Surfaces

E. J. Heilweil; M. P. Casassa; R. R. Cavanagh; J. C. Stephenson

doi:10.1117/12.946534

2 April 1985 Vibrational Energy Relaxation Of Adsorbates On Surfaces

E. J. Heilweil, M. P. Casassa, R. R. Cavanagh, J. C. Stephenson

Proceedings Volume 0533, Ultrashort Pulse Spectroscopy and Applications; (1985) https://doi.org/10.1117/12.946534
Event: 1985 Los Angeles Technical Symposium, 1985, Los Angeles, United States

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.

Citation Download Citation

E. J. Heilweil, M. P. Casassa, R. R. Cavanagh, and J. C. Stephenson "Vibrational Energy Relaxation Of Adsorbates On Surfaces", Proc. SPIE 0533, Ultrashort Pulse Spectroscopy and Applications, (2 April 1985); https://doi.org/10.1117/12.946534

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