Potential modulation of equilibrium and excitation phenomena at the electrolyte-solid interface. [Second harmonic generation; interfacial optical spectroscopy]
Optical SHG (second harmonic generation) is well suited for interfacial studies and for probing the electrolyte-solid interface. A series of experiments were completed on Ag(001). The bulk isotropic ({gamma}) and anisotropic ({zeta}) susceptibilities were determined and can be carried over to other Ag orientations. The only allowed surface susceptibility, {chi}(zxx), was negligible only as long as the surface was uncharged or negatively charged. To explain the results, a phenomenological model has been developed for four-field mixing; the static electrochemical field is a third ''incoming field'' (together with the two optical SHG fields) that mix via a third-order surface susceptibility. The potential-induced surface reconstruction on Ag(111), attributed last year to adsorbed sulfate ions, was studied further; the reproducibility problem in the trend toward the fully reconstructed surface continued to be found. Alternate explanations for the apparent symmetry change are being explored. The detection system on the surface Raman facility was improved. (DLC)
- Research Organization:
- Colorado School of Mines, Golden, CO (United States). Dept. of Physics
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-86ER45253
- OSTI ID:
- 7204420
- Report Number(s):
- DOE/ER/45253-7; ON: DE93001685
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SILVER
ELECTROCHEMISTRY
HARMONIC GENERATION
OPTICAL PROPERTIES
ELECTROLYTES
INTERFACES
MONOCRYSTALS
ORIENTATION
PROGRESS REPORT
RAMAN SPECTROSCOPY
RESEARCH PROGRAMS
SULFATES
SURFACES
CHEMISTRY
CRYSTALS
DOCUMENT TYPES
ELEMENTS
FREQUENCY MIXING
LASER SPECTROSCOPY
METALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECTROSCOPY
SULFUR COMPOUNDS
TRANSITION ELEMENTS
360104* - Metals & Alloys- Physical Properties
400400 - Electrochemistry