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Laser Raman spectra have been recorded for several ionic nitrates. Band multiplicities in the out-of-plane deformation and its first overtone and in the symmetric stretching region are reported and discussed according to the selection rules of the appropriate factor group representation. Evidence exists for mixing between vibrations of the same symmetry species in the first overtone region of the out-of-plane deformation.
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M. H. Brooker (1970) studied this question.
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