Raman Spectra of Mercury(I) and Mercury(II) Iodides in the Solid State

The Raman spectrum of yellow HgI contains features at 110 and 192 cm assignable to Hg-Hg stretching and Hg stretching respectively. The spectrum of yellow HgI at c. 150° shows bands at 33 cm (I-Hg bending) and 133 cm(Hg-I stretching). The Raman shifts for red HgI are 24, 111, and 137 cm, attributable to I-Hg bending, symmetric and asymmetric Hg stretching respectively. Assignments are made on the basis of factor group analyses on the Bravais unit cells. Some force constants are calculated