The polarized Raman spectra of naphthalene single crystal are recorded with a laser Raman spectrometer. Relative intensites of Raman lines in various polarizations are accurately measured by photon‐counting technique. All the strong lines are polarized in the c′c′ and bb polarizations, and the polarization data alone are not sufficient to decide the symmetry of a Raman active vibration. The oriented gas model is found not adequate to fully understand the results. The polarization data have to be interpreted in terms of the electronic spectrum of naphthalene.
The normal vibrations of tetrahedral hydride and octahedral hexafluoride have been studied in the Cartesian coordinates. Equations relating the force constants with the vibrational frequencies are derived by using symmetry coordinates. Numerical values of the force constants and normal coordinates of these molecules are tabulated.
Force constants of planar symmetric XYn type molecules in the Cartesian space have been derived in terms of the vibrational frequencies. The force constants and normal coordinates of some planar XY3 molecules with available isotoptic data are worked out. Further study of infrared absorption spectra of square planar XY4 complex ions will be needed for the present normal coordinate analysis.
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