DIRECT EVIDENCE FOR CHARGE-TRANSFER PHOTODISSOCIATION AT A METAL-SURFACE - CCL4/AG(111)

被引:101
作者
DIXONWARREN, SJ
JENSEN, ET
POLANYI, JC
机构
[1] Department of Chemistry, University of Toronto, Toronto, Ont.
关键词
D O I
10.1103/PhysRevLett.67.2395
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Observation of negative ions desorbing from an adsorbate-covered metal surface following UV laser irradiation gives direct evidence that the mechanism responsible is charge-transfer photodissociation (CT-PDIS). We have studied photoemission of ions for CCl4/Ag(111) + hv --> Cl-(g) + CCl3/Ag(111). The CT-PDIS mechanism is supported by comparison of the yield of desorbing Cl- and photoemitted electrons with the variation in UV photon energy and surface coverage. Charge transfer leading to negative-ion emission is also shown to occur in the absence of photoelectron emission (i.e., hv < phi) for CCl4/Ag(111).
引用
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页码:2395 / 2398
页数:4
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