Pure rotational spectra of 32SD+3 and 34SD+3: Determination of the substitution structure of the sulfonium ion

The pure rotational spectrum of the 32SD+3 ion was observed in the 152–457 GHz frequency region using a magnetically confined negative glow discharge as ion production source. Moreover, the J=1←0, K=0 transition of the isotopic species 34SD+3 was measured at 151858.506 MHz. The rotational constants B0 determined from the analysis of the transition frequencies, along with the B0 constant of 32SH+3 obtained by Lee et al. [S.K. Lee, H. Ozeki, S. Saito, S. Yamamoto, Chem. Phys. Lett. 224 (1994) 21] and the C0 axial rotational constants of 32SH+3 and 32SD+3 from high-resolution infrared spectroscopy [T. Nakanaga, T. Amano, J. Mol. Spectrosc. 133 (1989) 201; C. Xia, M.M. Sanz, S.C. Foster, J. Mol. Spectrosc. 188 (1998) 175], were used to calculate the substitution structure of the ion.