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Resonance enhancement of local modes in the Raman spectra of mixed molecular crystals and biological polymers
Author(s) -
Chen F. P.,
Hanson D. M.
Publication year - 1976
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.1250050310
Subject(s) - delocalized electron , raman spectroscopy , resonance (particle physics) , raman scattering , chemistry , molecular physics , coherent anti stokes raman spectroscopy , x ray raman scattering , electronic structure , chemical physics , materials science , atomic physics , nuclear magnetic resonance , computational chemistry , physics , optics , organic chemistry
The effect of electronic resonances on the cross sections for Raman scattering from localized and delocalized vibrational modes is considered for the cases where the resonance is with a localized electronic state and with a delocalized electronic state. It is concluded that resonance with a localized electronic state increases the Raman cross section of the localized mode significantly more than that of the delocalized mode while resonance with a delocalized electronic state has the opposite effect. Furthermore, a coupling of electronic states following a conformational change in a polymer is predicted to decrease the resonance Raman cross section of a localized vibrational mode. Consequently, observations of such effects will serve to identify local phonon modes in mixed molecular crystals and provide information about conformational change in biomolecules.