Structure and electronic properties of gold adsorbed on Ti(0 0 0 1) |
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Authors: | N Tsud F Šutara K Veltruská V Cháb V Matolín |
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Institution: | a Charles University, Faculty of Mathematics and Physics, Department of Electronics and Vacuum Physics, V Holešovi?kách 2, 18000 Prague 8, Czech Republic b Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 16200 Prague, Czech Republic c Sincrotrone Trieste, Strada Statale 14, km 163.5, 34012 Basovizza-Trieste, Italy d TASC, INFM, in Area di Ricerca, Strada Statale 14, km 163.5, 34012 Basovizza-Trieste, Italy |
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Abstract: | The Au/Ti(0 0 0 1) adsorption system was studied by low energy electron diffraction (LEED) and photoemission spectroscopy with synchrotron radiation after step-wise Au evaporation onto the Ti(0 0 0 1) surface. For adsorption of Au at 300 K, no additional superstructures were observed and the (1 × 1) pattern of the clean surface simply became diffuse. Annealing of gold layers more than 1 ML thick resulted in the formation of an ordered Au-Ti surface alloy. Depending on the temperature and annealing time, three surface reconstructions were observed by LEED: (√3 × √3) R30°, (2 × 2) and a one-dimensional incommensurate (√3 × √3) rectangular pattern. The Au 4f core level and valence band photoemission spectra provided evidence of a strong chemical interaction between gold and titanium. The data indicated formation of an intermetallic interface and associated valence orbital hybridization, together with diffusion of gold into the bulk. Au core-level shifts were found to be dependent on the surface alloy stoichiometry. |
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Keywords: | 73 61 At 68 35 Bs 61 14 Hg 79 60 Dp |
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