Adsorption of oxygen on Rh(110): a LEED, Auger electron spectroscopy and thermal desorption study |
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Authors: | G. Comelli V. R. Dhanak M. Kiskinova N. Pangher G. Paolucci K. C. Prince R. Rosei |
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Affiliation: | Sincrotrone Trieste, Padriciano 99, 34012, Trieste, Italy |
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Abstract: | The adsorption of oxygen on the Rh(110) surface has been studied by a variety of techniques. Low-energy electron diffraction shows the following patterns: (2 × 1)p2mg at 1 ML coverage and temperatures between 125 and 300 K; (2 × 2)p2mg at 0.5 ML coverage after heating to above 470 K; c(2 × 8) and complex streaked c(2 × 2n) patterns at coverages above 0.5 after heating to 470 K. These results are in partial agreement with previous work. Models for the first two structures are suggested. In the (2 × 2) structure, the oxygen is found to be much less reactive with CO at room temperature than in the (2 × 1) structure, suggesting that it is subsurface. A metastable (1 × 2) structure was produced from the (2 × 2) by reduction of the oxygen by CO at 450 K, and is interpreted as a surface reconstruction. |
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