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The pure rotational spectrum of CF3SF5 has been observed in the microwave region. It is confirmed that the structure is almost certainly trifluoromethyl sulfurpentafluoride, and some evidence relating to the molecular parameters is obtained. Several vibrational states have been observed, including the torsional vibration from which the height of the potential barrier can be estimated as 220 cm−1.
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Kisliuk et al. (1952) studied this question.
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