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Thioformaldehyde is an abundant molecule in various regions of theinterstellar medium. However, available laboratory data limit the accuracies ofcalculated transition frequencies in the submillimeter region, in particularfor minor isotopic species. We aim to determine spectroscopic parameters ofisotopologs of H2CS that are accurate enough for predictions well into thesubmillimeter region. We investigated the laboratory rotational spectra ofnumerous isotopic species in natural isotopic composition almost continuouslybetween 110 and 377 GHz. Individual lines were studied for most species in twofrequency regions between 566 and 930 GHz. Further data were obtained for thethree most abundant species in the 1290-1390 GHz region. New or improvedspectroscopic parameters were determined for seven isotopic species.Quantum-chemical calculations were carried out to evaluate the differencesbetween ground state and equilibrium rotational parameters to derivesemi-empirical equilibrium structural parameters. The spectroscopic parametersare accurate enough for predictions well above 1 THz with the exception ofH2(13)C(34)S where the predictions should be reliable to around 700 GHz.

Laboratory spectroscopic study of isotopic thioformaldehyde, H$_{2}$CS, and determination of its equilibrium structure