Abstract
A model is presented to explain the change in work function as a function of alkali metal coverage on transition metals based on dipole-dipole depolarization assuming a coverage-dependent polarizability of the adsorbate-substrate complex. The fit of the model is a great improvement over fixed-polarizability depolarization models, and the resultant prediction for the variation of the polarizability with coverage is qualitatively similar for different alkalis on the same surface, and quantitatively similar for the same alkali on different surfaces.
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