期刊
SURFACE SCIENCE
卷 603, 期 10-12, 页码 1622-1628出版社
ELSEVIER
DOI: 10.1016/j.susc.2008.10.056
关键词
Electron spin resonance; Infrared absorption spectroscopy; Magnesium oxides; Gold
资金
- EU
- Fond der chemischen Industrie
- Deutsche Forschungsgemeinschaft
Single gold atoms deposited on single crystalline MgO(100) films grown on Mo(100) are characterized by electron paramagnetic resonance spectroscopy as well as IR spectroscopy using CO as probe molecules. In this article we describe the first angular dependent measurements to determine the principal hyperfine components of a secondary hyperfine interaction, namely, with O-17 of the MgO. The values determined here are in perfect agreement with theoretical expectations and corroborate the previously reported binding mechanism of Au atoms on the oxygen anions of the MgO terrace. The temperature dependent EPR data reveal an onset of Au atom mobility at about 80 K while the formation of Au particles occurs only above 125 K. By an analysis of the EPR line width in combination with STM measurements it is possible to deduce an increase of the interatomic distance above 80 K. The Au/CO complexes show a somewhat smaller temperature stability as compared to the Au atoms. The observed thermal stability is in perfect agreement with theoretical predictions for CO desorption. (C) 2009 Elsevier B.V. All rights reserved.
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