The Journal of Chemical Physics · 1945 · 37 citations · 5 references
Natural SciencesChemistryPhysicsAnalytical ChemistryOpticsSpectroscopyMolecular SpectroscopyOptical SpectroscopyPolarization OpticsRaman SpectroscopySpectroscopic Method ValidationConvergenceDepolarizationPolarized Raman SpectroscopyRaman Data AnalysisRaman InstrumentationRaman ScatteringRaman SpectraReciprocity
A method for obtaining depolarization factors of Raman lines is described in which a 90°, split-field Polaroid disk is placed in contact with the window of the Raman tube and is focused upon the slit of the spectrograph by means of a condensing lens. Corrections for real or apparent polarization owing to the spectrograph, reciprocity failure of the plates, and convergence errors are made. The precision of the results was tested by measurements on five different spectrograms of CCl4. The results indicated that the method is equal in precision to the method of Reitz. Intensities were obtained by use of a Gaertner microdensitometer. Depolarization factors for toluene were also obtained. It is shown that, for this method, a reasonable working rule is to regard those Raman lines having observed depolarization factors equal to or greater than 0.78 as depolarized, all others as polarized.
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