ELECTRIC-FIELD SCREENING IN AN ADSORBED LAYER - CO ON PT(111)

被引：44

作者：

LUO, JS

TOBIN, RG

LAMBERT, DK

机构：

[1] MICHIGAN STATE UNIV,CTR FUNDAMENTAL MAT RES,E LANSING,MI 48824

[2] GM CORP,DEPT PHYS,RES & ENVIRONM STAFF,WARREN,MI 48090

来源：

CHEMICAL PHYSICS LETTERS | 1993年 / 204卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(93)89184-J

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：

The IR cross section and Stark tuning rate of CO on Pt (111) versus coverage are measured. (The Stark tuning rate is the variation of vibrational frequency with applied electric field.) We interpret the observations as coverage-dependent screening of applied static and IR fields at CO's adsorption site. In contrast to the standard dipole-dipole coupling model, we find that static and IR screening depend differently on coverage. We also find that the local field Stark tuning rate for CO on Pt (111) in vacuum is half that at the electrochemical double layer. Possible explanations of our results are discussed.

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页码：445 / 450

页数：6

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