Pure rotational spectra of CS

The pure rotational spectra of CS and its isotopomers (CS)-C-12-S-33, (CS)- C-12-S-34, (CS)-C-13-S-32, (CS)-C-13-S-33, (CS)-C-13-S-34 including the ver y rare isotopomer (CS)-C-12-S-36 were observed. The rotational spectra incl ude ground and vibrationally excited transitions up to v - 16. The new meas urements have been performed with the Cologne terahertz spectrometer coveri ng the frequency region from 259 to 1075 GHz. These newly observed rotation al transitions together with earlier data were fitted to a Dunham-type Hami ltonian. The obtained isotopically invariant parameters include vibrational and rotational expansion coefficients.