Abstract
The microwave rotational spectra of the 32S and 34S isotopic species of ethylene sulfone have been observed. The rotational constants A, B, and C in megahertz are: 6676.06, 4924.01 and 3759.97 for the 32S species; and 6679.20, 4917.07, and 3757.64 for the 34S species. The structural parameters obtained are r(S–O) = 1.42 ± 0.02 Å, r(C–C) = 1.586 ± 0.01 Å, r (C–S) = 1.76 ± 0.02 Å, and ∠OSO = 124 ± 2o, with the assumption that the C–H distance and ∠HCH and ∠H2CC angles are the same as those of ethylene sulfide. From the measurements of Stark shifts, the dipole moment has been determined to be 4.47 ± 0.02 D.

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