PHOTOCHEMISTRY OF ADSORBED MOLECULES .5. ULTRAVIOLET PHOTODISSOCIATION OF OCS ON LIF(001)

被引：42

作者：

LEGGETT, K ^{[1
]}

POLANYI, JC ^{[1
]}

YOUNG, PA ^{[1
]}

机构：

[1] UNIV TORONTO, DEPT CHEM, TORONTO M5S 1A1, ONTARIO, CANADA

来源：

JOURNAL OF CHEMICAL PHYSICS | 1990年 / 93卷 / 05期

关键词：

D O I：

10.1063/1.458795

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dynamical studies of the UV photochemistry of submonolayer coverages of OCS physisorbed on 116 K LiF(001) are presented. Following pulsed ultraviolet laser irradiation (λ 222 nm), translational energy and angular distributions were obtained for photolysis products by angle-resolved time-of-flight mass spectrometry. Photolysis of adsorbates gave rise to distributions which differed markedly from gas phase photodissociation. Energetic sulphur and CO fragments were detected for coverages ≥10-5 monolayers. The cross section for photolysis in the adsorbed state was enhanced 103-104X relative to the gas phase. The dynamics for these photoprocesses were found to vary with adsorbate coverage, indicative of a catalytic influence of the surface on the photochemistry. © 1990 American Institute of Physics.

引用

页码：3645 / 3658

页数：14

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