COADSORBATE-INDUCED UNDERPOLARIZATION OF ALKALI OVERLAYERS

被引：22

作者：

HESKETT, D ^{[1
]}

TANG, D ^{[1
]}

SHI, X ^{[1
]}

TSUEI, KD ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973

来源：

CHEMICAL PHYSICS LETTERS | 1992年 / 199卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(92)80060-O

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：

We have measured the work-function changes induced by the coadsorption of oxygen or carbon monoxide with sodium as a function of alkali precoverage for the systems O2/Na/Cu(111), O2/Na/Ni(111). and CO/Na/Ni(111). In agreement with results for many other related systems, we observe anomalous work-function decreases for initial doses of both O2 and CO for high alkali precoverages. Our data are inconsistent with the standard explanations for these results. We propose a new model in which the work-function changes induced by the coadsorbate involve a combination of coadsorbate dipole moment and coadsorbate-induced undepolarization of the alkali overlayer.

引用

页码：138 / 143

页数：6

共 44 条

[1] THE ROLE OF A SUPEROXO-LIKE SPECIES IN THE OXIDATION OF ALKALI METAL-PRECOVERED GAAS(100) SURFACES [J].