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Excitation mechanisms in the photochemistry of adsorbed SO2

✍ Scribed by M. Wolf; X.-Y. Zhu; J.M. White

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 469 KB
Volume: 196
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85714-l

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✦ Synopsis

It is demonstrated that direct and substrate-mediated excitation mechanisms in surface photochemical reactions can be discriminated based on the pronounced angular dependence of the electric fields at the vacuum interface of a transparent substrate covered with a thin metal film. We can unambiguously establish the change from a direct to a substrate-mediated excitation mechanism in the photodesorption of SO2 (hv= 6.4 eV) adsorbed on a quartz prism, with and without a 300 A Ag film.

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