Magnetic and electric dipole moments of the $H\ {}^3Δ_1$ state in ThO

Details Magnetic and electric dipole moments of the $H\ {}^3Δ_1$ state in ThO Magnetic and electric dipole moments of the $H\ {}^3Δ_1$ state in ThO

2011-07-12

arxiv.org/abs/1107.2287v1

Phys. Rev. A 84, 034502 (2011)

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.84.034502

The metastable $H \ {}^3\Delta_1$ state in the thorium monoxide (ThO) molecule is highly sensitive to the presence of a CP-violating permanent electric dipole moment of the electron (eEDM). The magnetic dipole moment $\mu_H$ and the molecule-fixed electric dipole moment $D_H$ of this state are measured in preparation for a search for the eEDM. The small magnetic moment $\mu_H = 8.5(5) \times 10^{-3} \ \mu_B$ displays the predicted cancellation of spin and orbital contributions in a ${}^3 \Delta_1$ paramagnetic molecular state, providing a significant advantage for the suppression of magnetic field noise and related systematic effects in the eEDM search. In addition, the induced electric dipole moment is shown to be fully saturated in very modest electric fields ($<$ 10 V/cm). This feature is favorable for the suppression of many other potential systematic errors in the ThO eEDM search experiment.

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