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Some interference effects in resonance coherent Raman spectroscopy
Author(s) -
Kircheva P. P.,
Simeonov S. D.
Publication year - 1986
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.1250170413
Subject(s) - raman spectroscopy , coherent anti stokes raman spectroscopy , resonance (particle physics) , polarizability , interference (communication) , molecular physics , excited state , raman scattering , chemistry , resonance raman spectroscopy , atomic physics , line (geometry) , spectral line , nuclear magnetic resonance , molecule , optics , physics , quantum mechanics , telecommunications , channel (broadcasting) , geometry , mathematics , organic chemistry , computer science
Coherent Raman spectra for resonance pumping conditions and a three‐frequency variant were claculated for polyatomic molecules. A model based on density of states and displaced harmonic oscillators was used. The contributions of different intermediate vibrational levels in the electronic state S 1 to the resonance Raman susceptiblity χ (3) R(r)and the interference of χ (3) R(r)with a non‐resonant electronic background are discussed. It is shown that many intermediate levels belonging to S 1 and corresponding to two excited vibrations (the relevant Raman vibration and either one of the others) influence the spectrum significantly, in contrast to the case with absorption. The asymmetry of the Raman line is due mainly to the interference with a non‐resonant background. The method used takes into account the influence of the interference of neighbouring lines on the line shape and also the possible deformation of the lines by the dispersion of the Raman polarizability. The results are in qualitative agreement with known experimental data for some dyes.