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The origin of anti‐resonance in preresonance Raman scattering
Author(s) -
Hassing S.
Publication year - 1997
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/(sici)1097-4555(199710)28:10<739::aid-jrs111>3.0.co;2-u
Subject(s) - resonance (particle physics) , chemistry , excitation , raman scattering , raman spectroscopy , molecular physics , scattering , depolarization ratio , atomic physics , optics , physics , quantum mechanics
The anti‐resonance phenomenon in Raman scattering was studied in the preresonance region of an allowed electronic transition. It is shown that the anti‐resonance in the scattering of both totally and non‐totally symmetric modes can be explained in terms of an analytical model. The necessary and general conditions for obtaining an anti‐resonance are derived. The importance of comparing resonance and preresonance data (showing the anti‐resonance effect), in order to obtain reliable molecular parameters from the experiments, is demonstrated. For both totally and non‐totally symmetric modes it is shown that, depending on the nature and number of the electronic states that contribute to the scattering, the anti‐resonance in the excitation profile may be followed by a dramatic dispersion in the depolarization ratio. By comparing model calculations of the depolarization ratio and the excitation profile with experimental data, it is shown that both of these quantities are needed in order to discriminate between different theoretical models. © 1997 John Wiley & Sons, Ltd.