Abstract

Raman spectra are reported for gaseous BiBr₃ and PbCl₂ at temperatures just above their boiling points. The strong resonance fluorescence due to subhalide species that is normally observed in these vapors (with 4880 Å excitation) was suppressed by addition of equimolar amounts of the corresponding mercuric halide. The observed Raman bands for the BiBr₃-HgBr₂ sample, which are attributable to BiBr₃, confirm a pyramidal structure having C_3v point symmetry. The spectrum attributable to PbCl₂ in the case of the PbCl₂-HgCl₂ sample is consistent with a symmetric bent structure.

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