Abstract
Effects of alloying with a few percents of Ge on the Pt electronic structure and adsorption of NO molecules are investigated by photoemission spectroscopy, reflection-absorption infrared spectroscopy, thermal desorption spectroscopy, and photo-stimulated desorption. The NO molecule exclusively occupies the on-top site on the Pt(111)-Ge surface alloy in contrast to the bridge and the on-top adsorption on Pt(111). The adsorption energy of NO is dramatically reduced compared with that on Pt(111). The Pt d-band seems to be downward shifted in energy suggesting the d-band filling. The change in chemical properties of Pt(111) for molecular adsorption is discussed in the framework of the rigid-band model.
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