Spectroscopic studies of the SO2 discharge system. I. The microwave spectrum and structure of S2O

The microwave spectrum of S₂O has been reexamined in order to obtain reliable predictions of all rotational transitions up to J=50 in the frequency region 10–130 GHz and to determine the structure of the molecule. A centrifugal distortion analysis has been carried out on the ground state and lowest bending vibrational state of ³²S³²S¹⁶O. Centrifugal distortion corrected rotational constants have also been obtained for ³⁴S³²S¹⁶O and ³²S³⁴S¹⁶O. These observations allowed the determination of the structure: r_s(S–S)=1.88248(10) Å, r(S–O)=1.4637(5) Å, $\angle \mathrm{SSO}{\text{=118.26(7)}}^{\mathrm{o}}$ .