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Hanyš, P.; Janeček, P.; Šutara, F.; Tsud, N.; Matolín, V.; Nehasil, V.
Surface science, 09/2007, Letnik: 601, Številka: 18Journal Article, Conference Proceeding
An ultra thin Sn layer (6 Å) was deposited onto Rh(1 1 1) single crystal surface. We followed changes in low energy electron diffraction (LEED) pattern during progressive annealing together with development of CO adsorption capacity and photoelectron spectra obtained using synchrotron radiation. Surface bimetallic alloy development with increasing temperature was followed by LEED and synchrotron radiation photoelectron spectroscopy (SRPES). LEED results show several surface structure of Sn/Rh(1 1 1) sample in dependence on sample temperature. If it increases, the surface structure develops to the stable ordered (√3 × √3) R30° structure. Surface CO adsorption depends strongly on the amount of Sn in the top sample layer then it corresponds to the development of the surface structure. The CO adsorption capacity raises with increasing temperature. Photoelectron spectra of Sn and Rh core levels and their shifts and shapes were studied during the annealing and CO adsorption. The resulting spectra are used to discuss the Sn–Rh surface alloy creation. The goal of this paper is to demonstrate the CO adsorption on the Sn/Rh(1 1 1) surface. Valence band spectra measured at different primary energies are presented to demonstrate this effect. These spectra show different adsorption properties of the studied system in dependence on the amount of Sn in the top layer and geometric structure of the surface.
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