✦ LIBER ✦

Polarization probe of excitation mechanisms in surface photochemistry

✍ Scribed by X.-Y. Zhu; J.M. White; M. Wolf; E. Hasselbrink; G. Ertl

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 701 KB
Volume: 176
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)90237-4

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✦ Synopsis

Based on classical electrodynamic theory, cross sections for surface photochemical processes are derived as a function of the angle of incidence. Using s-and p-polarized light, the expected primary excitation mechanisms, i.e. direct excitation and substrate excitation, can be distinguished. Two examples are shown: for O2 on Pd( Ill), photo-induced desorption and dissociation at 6.4 eV are unambiguously due to substrate excitation, while for ClzCO on Pt ( 1 I I ), direct excitation plays an important role in photolysis at 4.4 eV.

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