Affiliation:
1. Physikalische Chemie II Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstr. 3 91058 Erlangen Germany
2. Theoretische Chemie Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstr. 3 91058 Erlangen Germany
3. Physikalische und Theoretische Chemie Freie Universität Berlin Arnimallee 22 14195 Berlin Germany
Abstract
AbstractThis study addresses a fundamental question in surface science: the adsorption of halogens on metal surfaces. Using synchrotron radiation‐based high‐resolution X‐ray photoelectron spectroscopy (XPS), temperature‐programmed XPS, low‐energy electron diffraction (LEED) and density functional theory (DFT) calculations, we investigated the adsorption and thermal stability of bromine on Rh(111) in detail. The adsorption of elemental bromine on Rh(111) at 170 K was followed in situ by XPS in the Br 3d region, revealing two individual, coverage‐dependent species, which we assign to fcc hollow‐ and bridge‐bound atomic bromine. In addition, we find a significant shift in binding energy upon increasing coverage due to adsorbate‐adsorbate interactions. Subsequent heating shows a high thermal stability of bromine on Rh(111) up to above 1000 K, indicating strong covalent bonding. To complement the XPS data, LEED was used to study the long‐range order of bromine on Rh(111): we observe a (√3×√3)R30° structure for low coverages (≤0.33 ML) and a star‐shaped compression structure for higher coverages (0.33–0.43 ML). Combining LEED and DFT calculations, we were able to visualize bromine adsorption on Rh(111) in real space for varying coverages.
Funder
Deutsche Forschungsgemeinschaft
Fonds der Chemischen Industrie
Subject
Physical and Theoretical Chemistry,Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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