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Experimental work on unoccupied electronic states in adsorbate systems on metallic substrates is reviewed with emphasis on recent developments. The first part is devoted to molecular adsorbates. Weakly chemisorbed hydrocarbons are discussed briefly, followed by an exhaustive inverse photoemission (IPE) study of the CO bond to the transition metals Ni, Pd and Pt. Adsorbed NO is taken as an example to demonstrate the persisting discrepancies in the interpretation of IPE spectra. In the second part, atomic adsorbates are discussed. The quantum well state model is applied to interpret the surface states in reconstructing and non-reconstructing adsorption systems of alkali metals and hydrogen. A recent controversy on the unoccupied electronic states of the Cu(110)/O p(2 x 1) surface is reviewed critically. The quantum well state model is then compared to tight binding and local-density-functional calculations of the unoccupied bands and the deficiencies of the various approaches are identified. Finally, the relation between the surface state model and more chemically orientated models of surface bonding is briefly discussed.

Additional information

Authors: BERTEL E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Applied Physics A, Vol. 53 (1991) pp. 356-368
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