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High-coverage oxygen structures on Rh111: adsorbate repulsion and site preference is not enough
1Institut für Materialphysik and Centre for Computational Materials Science, Universität Wien, A-1090 Wien, Austria.
Oxygen atoms form a new structure on Rh(111), occupying both fcc and hcp sites, a behavior not explained by simple repulsion models. This study reveals new insights into oxygen adsorption on metal surfaces.
Area of Science:
- Surface Science
- Materials Science
- Physical Chemistry
Background:
- Understanding oxygen adsorption on metal surfaces is crucial for catalysis and materials science.
- Previous studies indicate oxygen favors fcc hollow sites on Rh(111).
- A new oxygen-induced structure with a specific periodicity and coverage has been identified.
Purpose of the Study:
- To investigate a novel oxygen-induced structure on Rh(111) with (2√3 x 2√3)R30° periodicity.
- To determine the adsorption sites of oxygen in this new structure.
- To elucidate the factors governing oxygen adsorption behavior.
Main Methods:
- High-resolution core-level spectroscopy
- Scanning tunneling microscopy (STM)
- Density functional theory (DFT) calculations
Main Results:
- Oxygen atoms occupy both fcc and hcp sites in the new (2√3 x 2√3)R30° structure.
- This site occupancy cannot be solely explained by pairwise adsorbate repulsion.
- Density-of-states contrast in STM can cause oxygen adatoms to appear as protrusions.
Conclusions:
- The new oxygen structure on Rh(111) exhibits unique adsorption site preferences.
- Advanced theoretical and experimental methods are essential for understanding complex surface phenomena.
- STM imaging of adatoms can be influenced by electronic structure effects.
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