When Surface Dynamics Fakes Symmetry -- Oxygen on Rh(100) Revisited
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916992380829696 |
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| author | Hammer, Lutz Kißlinger, Tilman Wagner, Margareta Neder, Reinhard B. Schmid, Michael Diebold, Ulrike Schneider, M. Alexander |
| author_facet | Hammer, Lutz Kißlinger, Tilman Wagner, Margareta Neder, Reinhard B. Schmid, Michael Diebold, Ulrike Schneider, M. Alexander |
| contents | Heating a long-range ordered adsorbate phase beyond its stability temperature does not necessarily result in a disordered phase, it can also break up into heavily fluctuating ordered domains. Temporal and/or spatial averaging over these fluctuations may give the impression of both a wrong periodicity and a false local symmetry. This can happen even below liquid-nitrogen temperature, so that the true nature of the phase might remain undetected. We demonstrate this scenario at the catalytically active Rh(100) surface covered by 1/2 monolayer of oxygen, using quantitative low energy electron diffraction (LEED), variable-temperature scanning tunneling microscopy (STM) and density functional theory (DFT). Using the example of CO adsorption, we show that local symmetry can have a decisive influence on the binding energy and thus the chemical reactivity. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2508_08474 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | When Surface Dynamics Fakes Symmetry -- Oxygen on Rh(100) Revisited Hammer, Lutz Kißlinger, Tilman Wagner, Margareta Neder, Reinhard B. Schmid, Michael Diebold, Ulrike Schneider, M. Alexander Materials Science Heating a long-range ordered adsorbate phase beyond its stability temperature does not necessarily result in a disordered phase, it can also break up into heavily fluctuating ordered domains. Temporal and/or spatial averaging over these fluctuations may give the impression of both a wrong periodicity and a false local symmetry. This can happen even below liquid-nitrogen temperature, so that the true nature of the phase might remain undetected. We demonstrate this scenario at the catalytically active Rh(100) surface covered by 1/2 monolayer of oxygen, using quantitative low energy electron diffraction (LEED), variable-temperature scanning tunneling microscopy (STM) and density functional theory (DFT). Using the example of CO adsorption, we show that local symmetry can have a decisive influence on the binding energy and thus the chemical reactivity. |
| title | When Surface Dynamics Fakes Symmetry -- Oxygen on Rh(100) Revisited |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.08474 |