Direct visual evidence for the chemical mechanism of surface-enhanced resonance Raman scattering via charge transfer

Mengtao Sun, Shasha Liu, Maodu Chen, Hongxing Xu

Research output: Contribution to journalArticlepeer-review

82 Citations (SciVal)

Abstract

We describe the chemical and electromagnetic enhancements of surface-enhanced resonance Raman scattering (SERRS) for the pyridine molecule absorbed on silver clusters, in which different incident wavelength regions are dominated by different enhancement mechanisms. Through visualization we theoretically investigate the charge transfer (CT) between the molecule and the metal cluster, and the charge redistribution (CR) within the metal on the electronic intracluster collective oscillation excitation (EICOE). The CT between the metal and the molecule in the molecule-metal complex is considered as an evidence for chemical enhancement to SERRS. CR within the metal on EICOE is considered as an evidence for the electromagnetic enhancement by collective plasmons. For the incident wavelength from 300 to 1000 nm, the visualized method of charge difference density can classify the different wavelength regions for chemical and electromagnetic enhancement, which are consistent with the formal fragmented experimental studies. Copyright (C) 2008 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)137-143
JournalJournal of Raman Spectroscopy
Volume40
Issue number2
DOIs
Publication statusPublished - 2009

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060), Solid State Physics (011013006)

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics
  • Condensed Matter Physics

Keywords

  • intracluster charge redistribution
  • density
  • charge difference
  • charge transfer
  • SERRS
  • chemical enhancement

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