Vinylsulfur pentafluoride (VSPF), a molecule with a four-fold internal rotor, -SF, has been studied with high resolution Fourier transform microwave spectroscopy. We believe that this is the first report of resolved four-fold internal rotation. As such, we have presented the tools needed to understand and analyze such a problem. These include debugging the ERHAM computer program necessary to fit the spectra and the free rotor to high barrier correlation diagram necessary to understand the torsional states of the four-fold rotor. The , , and torsional state rotational transitions are well resolved and assigned. Spectroscopic transitions of four isotopologues of VSPF, HC=CH-SF, the normal isotopologue, and the singly substituted S and C isotopologues were measured and assigned. Contrary to expectation, the torsional state could not be fit with only a semi-rigid Hamiltonian. The barrier to internal rotation, , is found to be 227 cm. calculations at the MP2 aug-cc-pVQZ level of theory and basis set were performed and the results of this calculation are compared to our experimental results.
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