In-Plane Structure of Underpotentially Deposited Copper on Gold (111) Determined by Surface EXAFS (Extended X-Ray Absorption Fine Structure).
Abstract
The Surface Extended X Ray Absorption Fine Structure (SEFAFS) spectrum of an electrochemically deposited ad-layer of copper on a gold (111) electrode immersed in solution and under potential control was obtained by employing fluorescence detection and grazing incidence geometry. The x-rays were polarized parallel to the plane of the gold surface. Two peaks were observed in the radial distribution function, indicating two different near neighbors for copper. The near neighbors were determined to be gold at 2.58 plus or minus 0.03 angstrom and copper at 2.92 plus or minus 0.03 angstroms. The copper-copper distance is identical to the gold-gold lattice spacing showing that at full coverage, the copper ad-layer forms at 1 x 1 commensurate layer on the gold (111) substrate. The intensity of the gold-copper scattering relative to the copper-copper suggests the copper atoms sit in 3 fold hollows sites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 28, 1988
- Accession Number
- ADA191263
Entities
People
- G. L. Borges
- J. G. Gordon Ii
- Lesser Blum
- M. G. Samant
- O. R. Melroy
Organizations
- University of Puerto Rico