Infrared Spectrum of CF3SF5

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Abstract
The infrared spectrum of CF3SF5 has been measured and analyzed between 30 and 4000 cm−1. A band found at 218.5 cm−1 is believed responsible for satellite lines observed previously in the microwave spectrum; the barrier to internal rotation might then be much lower than obtained previously by assuming these satellites were due to torsional oscillation. Twelve of the seventeen fundamentals were assigned in the infrared spectrum and estimates are given for the others. A plausible assignment is given for the overtone and combination bands also observed; this gives no evidence for any of the inactive fundamentals.

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