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Raman spectra were measured for BiBr, and BiCIJ in the polycrystalline and liquid phases. A new assignment for BiBr, is proposed on the basis of the temperature dependence of the Raman spectra. An abrupt spectral change originating from an order-disorder phase transition was observed in BiBr,. In the liquid phase, both compounds showed a very broad composite spectra in the Bi-X stretching vibration region, which can be understood as originating from a mixture of multiply charged bismuth halide complexes in addition to the monatomic halide anions.

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Polarized Raman measurements have been made for the totally symmetric vibration bands of a series of halogen-substituted methanes in the liquid state at room temperature. The effect of polarization mixing due to divergence was examined experimentally and eliminated. The observed systematic variations in depolarization ratio are discussed in connection with the bond polarizability theory.

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