Microwave Spectra of the Isotopomers of HCS[TSUP]+[/TSUP] and Its Substitution Structure

Rotational transitions of the isotopomers of HCS + in their ground vibrational states were observed in laboratory, and the frequencies were measured in the millimeter- and submillimeter-wave range of 72-396 GHz. The rotational constant B 0 was determined to be 18018.262(3), 20444.495(3), and 20991.572(4) MHz, and the centrifugal distortion constant D 0 was determined to be 14.56(2), 19.83(3), and 20.82(3) kHz for DCS + , H 13 CS + , and HC 34 S + , respectively, with the 3 σ deviations in parentheses. The substitution bond lengths of HCS + were derived to be r s (HC) = 1.0789 Å and r s (CS) = 1.4782 Å.