Abstract
Lead and copper monolayers (produced by underpotential deposition) on silver(111) and gold(111) surfaces, respectively, have been characterized by x-ray absorption spectroscopy and x-ray diffraction. The experiments were performed in situ, with the electrode immersed in aqueous electrolyte, and at a controlled potential. A combination of grazing incidence excitation and fluorescence detection (for x-ray absorption) provided the required sensitivity and surface selectivity. The metal adlayers are fully reduced (zero valent). Lead forms a well ordered two dimensional solid with a close packed hexagonal structure. Its lattice is slightly compressed relative to bulk lead and is incommensurate with the underlying silver lattice. The copper EXAFS is consistent with a commensurate overlayer with the copper atoms in the three fold sites. Oxygen atoms of the first layer of water or adsorbed electrolyte lie at a well defined distance from the metal adlayers.
Keywords
- Copper Atom
- Underpotential Deposition
- Mylar Film
- Close Packed Hexagonal Structure
- Stanford Synchrotron Radiation Laboratory
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© 1988 Springer-Verlag Berlin Heidelberg
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Gordon, J.G., Melroy, O.R., Blum, L. (1988). Geometrical Structure of Adlayers on Immersed Electrodes. In: Grunze, M., Weimer, J.J., Kreuzer, H.J. (eds) Diffusion at Interfaces: Microscopic Concepts. Springer Series in Surface Sciences, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-73632-2_17
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DOI: https://doi.org/10.1007/978-3-642-73632-2_17
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