Raman spectrum of sulfur hexafluoride in the gaseous and solid states

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Abstract The Raman spectrum of gaseous SF 6 was studied with the aid of a multiple-reflection Raman tube and a 3-prism glass spectrograph of reciprocal linear dispersion 15 A/mm at 4358 A. All three Raman-active fundamentals were observed, at 769.4 ( a 1g ), 639.5 ( e g ), and 522 cm −1 ( f 2g ). In addition, a very weak sharp band was found at 690 cm −1 which is interpreted as the overtone of the inactive f 2 u fundamental. The Raman spectrum of a crystalline aggregate at −160°, −170°, and −185°C, was obtained. In addition to the three Raman-active fundamentals, two very weak bands were observed which probably arise from combinations of the f 2 g fundamental with low librational lattice modes.