Much of the current interest in COalkali metal coadsorption on transition metal surfaces [1 -3] stems from the known importance of alkali metal adsorbates in modifying the behavior of such surfaces, as witnessed by the role of alkali metals as promoters in catalytic reactions. Extensive spectroscopic studies have been conducted on several such systems, and a feature of special note is the very pronounced (20% or more) lowering of the C-0 stretch-
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