The vibrational spectrum of thionynyl fluoride and its oxygen-18 isotopomer[1]

The vibrational spectrum of thionyl fluoride, SOF₂, has been reinvestigated by means of high resolution infrared and Raman spectroscopy. Substitution of oxygen-16 by oxygen-18 led to a definitive identification of those modes to which sulfur-oxygen motion makes a large contribution. The band structure of the sulfur-oxygen stretching vibration, which is obscured by Fermi resonance with a combination band in S¹⁶OF₂, has been resolved in S¹⁸OF₂. The experimental isotopic splittings are compared with those calculated by previous investigators.