Spectroscopy on the eEDM-sensitive states of ThF${}^{+}$

Abstract

An excellent candidate molecule for the measurement of the electron's electric dipole moment (eEDM) is thorium monofluoride (ThF${}^{+}$) because the eEDM-sensitive state, ${}^3{\Delta }_1$, is the electronic ground state, and thus is immune to decoherence from spontaneous decay. We perform spectroscopy on $X{}^3{\Delta }_1$ to extract three spectroscopic constants crucial to the eEDM experiment: the hyperfine coupling constant, the molecular frame electric dipole moment, and the magnetic $g$-factor. To understand the impact of thermal blackbody radiation on the vibrational ground state, we study the lifetime of the first excited vibrational manifold of $X{}^3{\Delta }_1$. We perform ab initio calculations, compare them to our results, and discuss prospects for using ThF${}^{+}$ in a new eEDM experiment at JILA.

9 pages, 8 figures

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• Electric Dipole Moments: A Global Analysis
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• Theoretical study of thorium monoxide for the electron electric dipole moment search, II: Electronic properties of $H^3{\Delta }_1$ in ThO
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