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


Personal Author(s) : Bradley, R ; Georgiadis, R ; Kevan, S D ; Richmond, G L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265622.pdf


Report Date : 27 May 1993


Pagination or Media Count : 43


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 Ag(lll) in both an aqueous electrolyte and in ultrahigh vacuum (UHV) and find that, when the Ag(lll) 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.... Ag(lll) electrode surfaces, Resonant optical second harmonic generation, Electronic structure.


Descriptors :   *SPECTROSCOPY , *NONLINEAR OPTICS , *ELECTROLYTES , *ULTRAHIGH VACUUM , *SILVER , FREQUENCY , ELECTRONICS , METALS , DENSITY , OBSERVATION , HARMONICS , RESPONSE , STATIC ELECTRICITY , CHARGE DENSITY , RESONANCE , ELECTRODES , SURFACES , ELECTROCHEMISTRY , STRUCTURES , SECOND HARMONIC GENERATION , ENVIRONMENTS , PREDICTIONS , MODELS


Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE