Evidence for a Photon-Driven Charge-Transfer Enhancement in the Surface- Enhanced Roman Scattering of DABCO at a Silver Electrode (Preprint)

Abstract

The surface-enhanced Raman (SER) spectra of the alphatic amine 1,4- diazabicyclo (2.2.2) octane adsorbed on the surface of silver electrodes has been studied in detail as a function of the electrode potential and the excitation energy. Variations in the SERS intensity resulting from the variation in these two parameters and the supporting electrolyte have been characterized and attributed to the existence of a photon-driven charge-transfer (PDCT) enhancement of one to two orders of magnitude, of the adsorbed DABCO molecule, which operates in addition to an electromagnetic enhancement. The direction of the charge transfer is from molecule to metal. Variations in the band frequencies of the adsorbed DABCO with electrode potential and with the supporting electrolyte have also been measured and ascribed to the existence of a ground state charge transfer between adsorbed DABCO and the silver electrode. The Raman spectrum of a charge-transfer complex between DABCO and iodine are presented for comparison.

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Document Details

Document Type
Technical Report
Publication Date
Aug 09, 1989
Accession Number
ADA211631

Entities

People

  • D. A. Guzonas
  • D. E. Irish
  • G. F. Atkinson

Organizations

  • University of Waterloo

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Charge Transfer
  • Chemical Synthesis
  • Chemistry
  • Dielectric Gases
  • Engineering
  • Frequency
  • Ion Lasers
  • Measurement
  • Military Research
  • Optical Materials
  • Radiation
  • Raman Scattering
  • Raman Spectra
  • Raman Spectroscopy
  • Scattering
  • Sodium Compounds
  • Universities

Fields of Study

  • Physics

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Nanoscale Plasmonic Nanotechnology
  • Polymer Science and Technology