Magnetic and electric dipole moments of the H 3Δ1 state in ThO

A. C. Vutha*, B. Spaun, Y. V. Gurevich, N. R. Hutzler, E. Kirilov, J. M. Doyle, G. Gabrielse, D. Demille

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The metastable H3Δ1 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 μH and the molecule-fixed electric dipole moment DH of this state are measured in preparation for a search for the eEDM. The small magnetic moment μH=8.5(5)×10-B displays the predicted cancellation of spin and orbital contributions in a 3Δ1 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.

Original languageEnglish (US)
Article number034502
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
StatePublished - Sep 29 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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