Accession Number:

ADA265622

Title:

Nonlinear Optical Spectroscopy of Ag(111) in Electrolyte and in Vacuum

Descriptive Note:

Technical rept. no. 2, May 92-May 93,

Corporate Author:

OREGON UNIV EUGENE DEPT OF CHEMISTRY

Report Date:

1993-05-27

Pagination or Media Count:

43.0

Abstract:

In this paper, we investigate the electronic structure of a metal surface in the presence of aqueous electrolyte and an applied potential by optical second harmonic generation SHG. We have obtained the detailed wavelength dependence lambda SH 300-350 nm of the SH response from Aglll in both an aqueous electrolyte and in ultrahigh vacuum UHV and find that, when the Aglll electrode is biased at the potential of zero charge PZC, the SH response is strongly correlated with the SH response in UHV. For the surface in both environments there is a sharp peak near 3.82 eV. Possible contributing factors to this peak are discussed. In the electrochemical environment, the effect of applied potential on the SH response at longer wavelengths, nonresonant regime, is consistent both with previous observations at fixed frequencies and predictions of the surface charge density SCD model. At resonant wavelengths, there is a dramatic deviation from behavior predicted by the SCD model, a result consistent with previous experiments at discrete wavelengths.... Aglll electrode surfaces, Resonant optical second harmonic generation, Electronic structure.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE