Abstract
In this paper experimental verification of the importance of electronic factors in determining the structure of chemisorbed species on various metals is presented. Furthermore, the modification of a single surface so as to change its chemisorption characteristics is demonstrated. Infrared spectra of NH 3 chemisorbed on vanadium and iron films at room temperature indicate adsorption occurs largely without dissociation. The NH 3 surface species are electron-donating with respect to the CO surface species. NH 3 does not adsorb in an undissociated form on our films of nickel and palladium. However adsorption of CO on these latter surfaces conditions them so that a NH 3 surface complex is stable. The stability of NH 3 on particular surfaces and its modification are explicable in terms of the electronic structure of the metal surface and a molecular orbital model of the bonding of NH 3 and CO to the metal surface.
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