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Methyl mercaptan (CH$_3$SH) is an important sulfur-bearing species in theinterstellar medium, terrestrial environment, and potentially in planetaryatmospheres. The aim of the present study is to provide accurate spectroscopicparameters for the most abundant minor isotopolog CH$_3$$^{34}$SH to supportradio astronomical observations at millimeter and submillimeter wavelengths.The rotational spectrum of CH$_3$$^{34}$SH, which is complicated by thelarge-amplitude internal rotation of the CH$_3$ group versus the $^{34}$SHframe, was investigated in the 49$-$510 GHz and 1.1$-$1.5 THz frequency rangesin natural isotopic abundance. The analysis of the spectrum was performed up tothe second excited torsional state, and the obtained data were modeled with theRAM36 program. A fit within experimental accuracy was obtained with a RAMHamiltonian model that uses 72 parameters. Predictions based on this fit areused to search for CH$_3$$^{34}$SH with the Atacama LargeMillimeter/submillimeter Array (ALMA) toward the hot molecular core Sgr B2(N2),but blends with emission lines of other species prevent its firm identificationin this source.

Rotational spectroscopy of isotopic species of methyl mercaptan at millimeter and submillimeter wavelengths: CH$_3$$^{34}$SH