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Field enhancement and molecular response in surface‐enhanced Raman scattering and fluorescence spectroscopy
Author(s) -
Käll Mikael,
Xu Hongxing,
Johansson Peter
Publication year - 2005
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1357
Subject(s) - raman spectroscopy , raman scattering , rhodamine 6g , fluorescence , x ray raman scattering , coherent anti stokes raman spectroscopy , molecule , molecular physics , chemistry , rhodamine , spectroscopy , analytical chemistry (journal) , fluorescence cross correlation spectroscopy , materials science , chemical physics , optics , fluorescence spectroscopy , physics , organic chemistry , chromatography , quantum mechanics
We present a theoretical analysis of surface‐enhanced Raman scattering and fluorescence emission from chromophoric molecules located at electromagnetic ‘hot spots’ in nanoparticle aggregates. The model combines classical electrodynamic enhancement effects with molecular quantum dynamics and allows us to quantify various molecular cross‐sections and spectral properties. For a model molecule that simulates rhodamine 6G, we find that an electromagnetic Raman enhancement of the order of 10 10 results in an effective Raman cross‐section of the order of 10 −14 cm 2 , in agreement with single‐molecule Raman measurements. Copyright © 2005 John Wiley & Sons, Ltd.