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Constraints on the use of polarization and angle-of-incidence to characterize surface photoreactions

✍ Scribed by Lee J. Richter; Steven A. Buntin; David S. King; Richard R. Cavanagh

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
387 KB
Volume
186
Category
Article
ISSN
0009-2614

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✦ Synopsis

It is demonstrated that for substrates with a large absolute value of the dielectric constant, comparison between surface photoreaction experiments and calculations of both the substrate absorption and the surface electric fields cannot distinguish between a substrate-mediated mechanism and a direct excitation mechanism characterized by a transition moment predominantly parallel to the surface. These two mechanisms cannot be distinguished since the rate for a direct excitation process is related to the incident-beam irradiance, while the rate for a substrate-mediated process is related to the irradiance intercepted by the surface.

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