Study of Synchrotron Radiation from Wet Electrode Surfaces
Abstract
The purpose of this project is to experimentally probe and theoretically model the structure of the charged liquid solid interface. X-rays from a synchrotron source are the experimental probe. Direct structural information about selected bonds in the electrode interface is obtained from grazing incidence fluorescence detected EXAFS. The absorption near edge structure provides information about the state of oxidation of the adatoms. Information on long range order of adlayers can be obtained from grazing incidence x-ray diffraction. Change in both the structure and the oxidation state as a function of the potential will give information on the inner layer of the electrode interface which has been unavailable until now. Successful in-situ EXAFS experiments, are carried out for silver underpotentially deposited on a gold (111) surface and bromide adsorbed on a silver (111) surface. Using in-situ grazing incidence x-ray scattering, we also measured the compressibility of a two dimensional lead layer on a silve (111) surface. One of the purposes of studying Ag on Au (111) was to see whether the Ag-Au distance varies with potential. It did not. Backscattering was also observed from oxygen, which was assigned to water adsorbed as specific sites on the Ag surfaces. The silver-oxygen distance was also constant, independent of potential. The bromide data is being analyzed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1988
- Accession Number
- ADA198971
Entities
Organizations
- International Business Machines Corporation (Armonk, NY)