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Torsion-rotation transitions in molecules exhibiting hindered internalrotation possess enhanced sensitivities to a variation of theproton-to-electron mass ratio. This enhancement occurs due to a cancellation ofenergies associated with the torsional and rotational degrees of freedom of themolecule. This effect occurs generally in every internal rotor molecule, but isexceptionally large in methanol. In this paper we calculate the sensitivitycoefficients of methyl mercaptan, the thiol analogue of methanol. The obtainedsensitivity coefficients in this molecule range from $K_\mu=-14.8$ to $+12.2$for transitions with a lower-level excitation energy below 10\,cm$^{-1}$.

Methyl mercaptan (CH3SH) as a probe for $\mu$ variation