title: Mercury monohalides: suitability for electron electric dipole moment searches.
abstract: Heavy polar diatomic molecules are the primary tools for searching for the T-violating permanent electric dipole moment of the electron (eEDM). Valence electrons in some molecules experience extremely large effective electric fields due to relativistic interactions. These large effective electric fields are crucial to the success of polar-molecule-based eEDM search experiments. Here we report on the results of relativistic ab initio calculations of the effective electric fields in a series of molecules that are highly sensitive to an eEDM, the mercury monohalides (HgF, HgCl, HgBr, and HgI). We study the influence of the halide anions on E_{eff}, and identify HgBr and HgI as attractive candidates for future electric dipole moment search experiments.
authors.affiliation: Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India.|Department of Physics, Calicut University, Calicut, Malappuram, Kerala 673 635, India.
authors.forename: V S
authors.initials: VS
authors.lastname: Prasannaa
authors.affiliation: Department of Physics and Astronomy, York University, Toronto, Ontario M3J 1P3, Canada.
authors.forename: A C
authors.initials: AC
authors.lastname: Vutha
authors.affiliation: Tokyo Metropolitan University, 1-1, Minami-Osawa, Hachioji-city, Tokyo 192-0397, Japan.|JST, CREST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Abe
authors.affiliation: Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India.
authors.forename: B P
authors.initials: BP
authors.lastname: Das