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In the quest to find a favourable triatomic molecule for detecting electricdipole moment of an electron (eEDM), we identify mercury hydroxide (HgOH) as anextremely attractive candidate from both experimental and theoreticalviewpoints. Our calculations show that there is a four-fold enhancement in theeffective electric field of HgOH compared to the recently proposed ytterbiumhydroxide (YbOH) [Phys. Rev. Lett. 119, 133002 (2017)] for eEDM measurement.Thus, in the (010) bending state associated with the electronic ground state,it could provide better sensitivity than YbOH from a theoretical point of view.We have also investigated the potential energy curve and permanent electricdipole moment of HgOH, which lends support for its experimental feasibility.Moreover, we propose that it is possible to laser cool the HgOH molecule byadopting the same technique as that in the diatomic polar molecule, HgF, asshown in [Phys. Rev. A 99, 032502 (2019)].

Mercury Hydroxide as a Promising Triatomic Molecule to Probe P,T-odd Interactions