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We present a new global study of the millimeter (mm) wave, submillimeter(sub-mm) wave, and terahertz (THz) spectra of the lowest three torsional statesof methyl mercaptan (CH$_3$SH). New measurements have been carried out between50 and 510 GHz using the Kharkiv mm wave and the Cologne sub-mm wavespectrometers whereas THz spectra records were used from our previous study.The new data, involving torsion-rotation transitions with $J$ up to 61 and$K_a$ up to 18, were combined with previously published measurements and fitusing the rho-axis-method torsion-rotation Hamiltonian. The final fit used 124parameters to give an overall weighted root-mean-square deviation of 0.72 forthe dataset consisting of 6965 microwave (MW) and 16345 far-infrared linefrequencies sampling transitions within and between the ground, first, andsecond excited torsional states. This investigation presents a two-foldexpansion in the $J$ quantum numbers and a significant improvement in the fitquality, especially for the MW part of the data, thus allowing us to providemore reliable predictions to support astronomical observations.

Rotational spectroscopy of methyl mercaptan CH$_3$$^{32}$SH at millimeter and submillimeter wavelengths