Excitation mechanisms in the photochemistry of adsorbed SO2

Wolf, Martin; Zhu, X.-Y.; White, J.M.

doi:10.1016/0009-2614(92)85714-L

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Excitation mechanisms in the photochemistry of adsorbed SO₂

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Wolf, Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf, M., Zhu, X.-Y., & White, J. (1992). Excitation mechanisms in the photochemistry of adsorbed SO₂. Chemical Physics Letters, 196(5), 422-426. doi:10.1016/0009-2614(92)85714-L.

Cite as: https://hdl.handle.net/21.11116/0000-000E-A864-4

Abstract

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 (hν = 6.4 eV) adsorbed on a quartz prism, with and without a 300 Å Ag film.