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Methyl mercaptan (CH3SH) is a known interstellar molecule with abundanceshigh enough that the detection of some of its minor isotopologues is promising.The present study aims at providing accurate spectroscopic parameters for the(13)CH3SH isotopologue to facilitate its identification in the interstellarmedium at millimetre and submillimetre wavelengths. Through careful analysis ofrecent CH3SH spectra from 49-510 GHz and 1.1-1.5 THz recorded at naturalisotopic composition, extensive assignments were possible not only for theground torsional state of (13)CH3SH, but also in the first and second excitedstates. The torsion-rotation spectrum displays complex structure due to thelarge-amplitude internal rotation of the (13)CH3 group, similar to the main andother minor isotopic species of methyl mercaptan. The assigned transitionfrequencies have been fitted to within experimental error with a 52-parametermodel employing the RAM36 programme. With predictions based on this fit,(13)CH3SH was searched for in spectra from the Atacama LargeMillimetre/submillimetre Array (ALMA) towards the Galactic centre source SgrB2(N2). Several transitions were expected to be observable, but all of themturned out to be severely blended with emission from other species, whichprevents us from identifying (13)CH3SH in this source.

Rotational spectrum of isotopic methyl mercaptan, (13)CH3SH, in the laboratory and towards Sagittarius B2(N2)