The single-crystal Raman spectrum of rhombic sulphur

Abstract

Single-crystal Raman polarisation data is used to assign the complex spectrum of rhombic sulphur in terms of internal and external modes. The data is also used to put the assignments of the two low-frequency infrared-active modes b₂ and e₁ and the inactive b₁ mode on a firmer basis. The depolarisation ratios for the two totally symmetric a₁ modes are calculated from the single-crystal intensity data and their values are compared with the depolarisation ratios observed in carbon disulphide solution.