Abstract
Investigation of the clean and atomic hydrogen covered Pt(111)( 3 × 3 ) R30° -Sn surface alloy has been carried out using high resolution core level photoelectron spectroscopy. The Pt 4 f 7 2 spectrum recorded from the clean surface alloy shows a single surface peak shifted −0.25 eV relative to the bulk. Its interpretation by means of a thermodynamical model using Born-Haber cycles confirms the surface alloy model. Adsorption of H does not change the line shape of the Sn 4d core level while a new surface component shifted by 0.59 eV compared to the bulk peak appears in the Pt 4 f 7 2 spectrum. These results are discussed in the light of the thermodynamical calculations. H atoms are believed to bind only to Pt atoms, and their adsorption site seems to be influenced by the tin present in the surface layer.
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