New Measurements of the Raman and the Far-Infrared Spectrum of S2Br2

The Raman spectrum of S₂Br₂ has been excited with a 6‐mW He–Ne laser operating at 6328 Å, and new depolarization ratios of the Raman bands have been obtained. The Raman band at 68 cm⁻¹ corresponding to the torsional mode is found to be polarized in disagreement with an earlier Raman investigation; the torsional mode is far‐infrared active at 70 cm⁻¹. The Raman band at 534 cm⁻¹ is found to be polarized and of type A in contrast to earlier work in which this band was found to be depolarized and of type $B$ . The Raman band at 304 cm⁻¹ is found to be depolarized and of type $B$ whereas in an earlier investigation the band was reported as polarized and of type $A$ . The new Raman and infrared data have been correlated with the right‐angle configuration of $C_2$ symmetry and new assignments have been made. Six coincident Raman‐ and infrared‐active fundamentals are now known from this work and the work of others.