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Measurement of Raman scattered intensities in media with natural or field‐induced optical activity
Author(s) -
Slobodyanyuk A. V.,
Schaack G.
Publication year - 1987
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.1250180806
Subject(s) - polarization (electrochemistry) , anisotropy , raman spectroscopy , magnetic field , physics , intensity (physics) , optics , raman scattering , electromagnetic radiation , ray , electromagnetic field , excitation , paramagnetism , condensed matter physics , chemistry , quantum mechanics
The intensity of Raman scattered light has been calculated for gyrotropic media, i.e. for media with a natural optical activity or a gyrotropy induced by a magnetic field. It is shown that anomalies in the scattered intensity are in general due to interference effects between the two orthogonally polarized normal modes of electromagnetic radiation propagating in the anisotropic crystal either in the incident or in the scattered beam or in both. Only when the state of polarization of the incident and the scattered waves agrees with one of these normal modes are clear results obtained which are simply to interpret. Hence the intensity anomalies sometimes observed in these media find an interpretation in the frame of the generally accepted theory. No breakdown of selection rules will occur in such media. The calculated results are compared with experimental findings in α‐quartz and in ZnP 2 and also in paramagnetic TmVO 4 and in CeF 3 in external magnetic fields.