Cs Adsorption on ZrC(111): Photoemission Spectroscopy Study

概要

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Room-temperature adsorption of Cs on ZrC(111) surface has been studied by core-level photoemission spectroscopy. The work function of the substrate surface decreases monotonically with Cs adsorption and approaches the Cs metal value without showing a clear work function minimum. Cs 4$d$ core-level lineshape analysis reveals that the loss peaks due to overlayer plasmon excitation are already formed in the initial stages of adsorption. These results suggest that the adsorbed Cs atoms are in a metallic state which is brought about by the formation of Cs islands at low coverages and that adsorption proceeds via growth of these islands.
2000-07-30