Coadsorbate-induced undepolarization of alkali overlayers
Date of Original Version
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.
Chemical Physics Letters
Heskett, D., D. Tang, X. Shi, and K. D. Tsuei. "Coadsorbate-induced undepolarization of alkali overlayers." Chemical Physics Letters 199, 1-2 (1992): 138-143. doi:10.1016/0009-2614(92)80060-O.