Zeeman interaction in ThO H 3Δ1 for the electron electric-dipole- moment search

A. N. Petrov*, L. V. Skripnikov, A. V. Titov, N. R. Hutzler, P. W. Hess, B. R. O'Leary, B. Spaun, D. Demille, G. Gabrielse, J. M. Doyle

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

The current limit on the electron's electric dipole moment, |de|<8.7×10-29 ecm (90% confidence), was set using the molecule thorium monoxide (ThO) in the J=1 rotational level of its H3Δ1 electronic state [J. Baron et al., Science 343, 269 (2014)SCIEAS0036-807510.1126/science.1248213] . This state in ThO is very robust against systematic errors related to magnetic fields or geometric phases, due in part to its Ω-doublet structure. These systematics can be further suppressed by operating the experiment under conditions where the g-factor difference between the Ω doublets is minimized. We consider the g factors of the ThO H3Δ1 state both experimentally and theoretically, including dependence on Ω doublets, the rotational level, and the external electric field. The calculated and measured values are in good agreement. We find that the g-factor difference between Ω doublets is smaller in J=2 than in J=1 and reaches zero at an experimentally accessible electric field. This means that the H,J=2 state should be even more robust against a number of systematic errors compared to H,J=1.

Original languageEnglish (US)
Article number062505
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume89
Issue number6
DOIs
StatePublished - Jun 11 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Petrov, A. N., Skripnikov, L. V., Titov, A. V., Hutzler, N. R., Hess, P. W., O'Leary, B. R., Spaun, B., Demille, D., Gabrielse, G., & Doyle, J. M. (2014). Zeeman interaction in ThO H 3Δ1 for the electron electric-dipole- moment search. Physical Review A - Atomic, Molecular, and Optical Physics, 89(6), [062505]. https://doi.org/10.1103/PhysRevA.89.062505