Title

Coadsorbate-induced undepolarization of alkali overlayers

Document Type

Article

Date of Original Version

10-30-1992

Abstract

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. © 1992.

Publication Title

Chemical Physics Letters

Volume

199

Issue

1-2

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