Surface Enhanced Raman Scattering from OH(-) Adsorbed on a Ag Electrode in Dilute Mg+2 Electrolytes.

Abstract

Surface enhanced Raman scattering (SERS) has been used to probe the adsorption of OH(-) on a silver electrode immersed in .01 to .001 M MgC12 containing micromolar quantities of either KMnO4 or dissolved C12. Strong spectra due to adsorbed OH(-), nearly identical to those obtained previously in > or = 1M MgC12 solutions, were obtained only if the oxidizing agent present. Besides the O-H stretching modes near 3600/cm, the low frequency modes due to the metal oxygen stretch are observed. A model is proposed in which adsorbed Mg+2 provides positive surface charge densities which are sites for absorbing OH(-). Three distinct absorption sites are predicted which is in accord with the observation of three O-H species during H2 production. These results, together with those previously obtained for alkali halides, indicate that corrosion processes in dilute aqueous media proceed by pathways dependent on the concentration and composition of dissolved salts which strongly affect the surface of water and its derivatives. Keywords: Surface enhanced Raman scattering, Adsorbed, Hydroxides, Magnesium ions.

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Document Details

Document Type
Technical Report
Publication Date
Jul 27, 1987
Accession Number
ADA182952

Entities

People

  • Paul B. Dorain

Organizations

  • Amherst College

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemistry
  • Classification
  • Electrodes
  • Frequency
  • Frequency Shift
  • Hydroxides
  • Impurities
  • Mass Spectrometry
  • Materials
  • Metals
  • Military Research
  • Monomolecular Films
  • Raman Scattering
  • Scattering
  • Security
  • Spectra
  • Standards

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nanoscale Plasmonic Nanotechnology
  • Surface Engineering/Surface Coating Technology.