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We study the sensitivity of the microwave and submillimeter transitions ofthe isotopologues of hydronium to the variation of the electron-to-proton massratio mu. These sensitivities are enhanced for the low frequency mixedinversion-rotational transitions. The lowest frequency transition (6.6 GHz)takes place for isotopologue H2DO+ and respective sensitivity to mu-variationis close to 200. This is about two orders of magnitude larger than thesensitivity of the inversion transition in ammonia, which is currently used forthe search of mu-variation in astrophysics.

Sensitivity of the isotopologues of hydronium to variation of the electron-to-proton mass ratio