Abstract
The adsorption of CO on Zn/Ru(001) surfaces has been studied using thermal desorption mass spectroscopy, core and valence level photoemission and Auger spectroscopy. At 80 K, CO does not adsorb on thick Zn films under ultra-high vacuum conditions. In contrast, adsorption of the molecule is observed on Zn atoms bonded to Ru(001). Bimetallic bonding induces a reduction of ∼ 0.5 eV in the binding energy of the core and valence levels of Zn. This shift probably increases the strength of ZnCO bond. CO molecules adsorbed on Zn adatoms show an O(1s) binding energy close to 535.2 eV and a desorption temperature of ∼ 125 K. Both properties indicate that π-backbonding is very weak in the ZnCO bond. For CO chemisorption on Zn/Ru(001) surfaces, Zn blocks Ru sites approximately on a one-to-one basis and induces a weakening of the RuCO bond.
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