Vibrational Spectra of Molecules and Complex Ions in Crystals. X. H2S and D2S

Abstract

The infrared spectra of H₂S in phases III, II, and I were studied at 66, 112, and 140°K, respectively. That of D₂S was studied in phase III at 66°K. The spectra of phase III consist of extremely sharp lines and the structure must be ordered, probably with eight molecules in a primitive unit cell of symmetry D_4h. The stretching bands in the spectra of phases II and I are broader and indicate a disordered arrangement of the hydrogen atoms. The structure of the crystal in phase III is discussed. The crystal spectra indicate that the fundamental frequencies in gaseous D₂S must be very nearly ν₂=855 cm^—1 and ν₃=1910 cm^—1.