The pure rotational spectra of CS and its isotopomers 12 C 33 S, 12 C 34 S, 13 C 32 S, 13 C 33 S, 13 C 34 S including the very rare isotopomer 12 C 36 S were observed. The rotational spectra include ground and vibrationally excited transitions up to v = 16. The new measurements have been performed with the Cologne terahertz spectrometer covering the frequency region from 259 to 1075 GHz. These newly observed rotational transitions together with earlier data were fitted to a Dunham-type Hamiltonian. The obtained isotopically invariant parameters include vibrational and rotational expansion coefficients.
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Ahrens et al. (1999) studied this question.
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