Measurement of linear stark interference in Hg199

T. H. Loftus, M. D. Swallows, W. C. Griffith, M. V. Romalis, B. R. Heckel, E. N. Fortson

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We present measurements of Stark interference in the 6S01→6P13 transition in Hg199, a process whereby a static electric field E mixes magnetic dipole and electric quadrupole couplings into an electric dipole transition, leading to E-linear energy shifts similar to those produced by a permanent atomic electric dipole moment (EDM). The measured interference amplitude, a SI=(aM1+aE2)=(5.8±1.5)×10 -9(kV/cm)-1, agrees with relativistic, many-body predictions and confirms that earlier central-field estimates are a factor of 10 too large. More importantly, this study validates the capability of the Hg199 EDM search apparatus to resolve nontrivial, controlled, and sub-nHz Larmor frequency shifts with EDM-like characteristics.

Original languageEnglish (US)
Article number253002
JournalPhysical review letters
Issue number25
StatePublished - Jun 24 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Loftus, T. H., Swallows, M. D., Griffith, W. C., Romalis, M. V., Heckel, B. R., & Fortson, E. N. (2011). Measurement of linear stark interference in Hg199. Physical review letters, 106(25), [253002].