DIRECT OBSERVATION OF ADSORBATE ADSORBATE REPULSIONS ALONG A ONE-DIMENSIONAL ARRAY - CO ON THE STEPS OF PT(112)

被引：37

作者：

HENDERSON, MA

SZABO, A

YATES, JT

机构：

[1] Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh

来源：

CHEMICAL PHYSICS LETTERS | 1990年 / 168卷 / 01期

关键词：

D O I：

10.1016/0009-2614(90)85101-H

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 orientation of CO on the steps of Pt(112) (Pt(S)-[3(111)×(001)]) was studied by digital electron stimulated desorption - ion angular distribution (ESDIAD), monitoring the a 3π-CO state. At low coverages, CO is adsorbed exclusively on step sites. At higher coverages, one-dimensional COCO repulsions result in tilting along the steps. When the steps are filled, all step CO molecules reorient orthogonally with new tilt angles up and down the steps. The selection of orthogonal tilt directions at various coverages has not been observed previously. These CO tilting effects are primarily due to steric repulsions rather than static dipole-dipole interactions. © 1990.

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页码：51 / 55

页数：5

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