Faculty Publications

Surface Photochemistry: 6. CH3Br on Pt(111)

Document Type

Article

Journal/Book/Conference Title

Journal of Physical Chemistry

Volume

93

Issue

22

First Page

7681

Last Page

7688

Abstract

The surface photochemistry of monolayer and submonolayer CH3Br on Pt(111) has been studied by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) to diagnose the results of continuous low-intensity ultraviolet irradiation. For wavelengths of 300 nm or less, and surface temperatures near 100 K, evidence is presented for the nonthermal cleavage of the C-Br bond and the formation of adsorbed Br atoms and CH3 groups. The wavelength dependence is strong and red-shifted compared to the gas-phase electronic excitation spectrum of CH3Br. By quantitative XPS, the maximum photolysis yield of retained Br from one monolayer of CH3Br is 60 ± 5%. While there is some slow thermal desorption, there is no detectable photodesorption of the parent during irradiation. Excitation mechanisms and product formation channels are discussed. © 1989 American Chemical Society.

Department

Department of Chemistry and Biochemistry

Original Publication Date

1-1-1989

DOI of published version

10.1021/j100359a030

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