Abstract
Trifluoromethylsulfur pentafluoride CF3SF5, which has been attracting much attention because of its unusually large global warming potential, was investigated by Fourier transform microwave spectroscopy in order to determine the twelve-fold potential barrier to internal rotation in this molecule. We have found the V12 value to be close to zero. Relaxation among internal-rotation and overall-rotation levels was found inhomogeneous, resulting in distributions quite different from thermal in low-temperature molecular beam, which might affect significantly thermodynamic properties of the molecule. Rotational spectra of the 13C species and the 34S species were also observed in natural abundance, leading to the rs CS bond length of 1.8808 (7) Å.
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