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Updated: May 30, 2026

Measurement of Outgassing Rates of Steels

Measurement of Outgassing Rates of Steels

Published on: December 13, 2016

Measurement of linear stark interference in 199Hg.

T H Loftus¹, M D Swallows, W C Griffith

¹Department of Physics, Box 351560, University of Washington, Seattle, Washington 98195-1560, USA.

Physical Review Letters

|July 21, 2011

Summary

We measured Stark interference in mercury-199 atoms, confirming theoretical predictions for electric dipole moments. This validates our atomic electric dipole moment (EDM) search apparatus for detecting subtle atomic shifts.

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Area of Science:

Atomic Physics
Quantum Mechanics
Spectroscopy

Background:

Atomic electric dipole moments (EDMs) are sensitive probes of New Physics beyond the Standard Model.
Measuring subtle atomic properties requires highly precise experimental techniques and theoretical calculations.
The (199)Hg atom is a promising system for EDM searches due to its large Schiff moment.

Purpose of the Study:

To measure Stark interference in the (61)S(0)→6(3)P(1) transition of (199)Hg.
To validate the experimental apparatus used for (199)Hg atomic electric dipole moment (EDM) searches.
To compare experimental results with relativistic, many-body theoretical predictions.

Main Methods:

Utilizing a static electric field to induce Stark interference.
Measuring the interference amplitude, which combines magnetic dipole (M1) and electric quadrupole (E2) couplings.
Employing the (199)Hg EDM search apparatus to detect sub-nHz Larmor frequency shifts.

Main Results:

The measured Stark interference amplitude is (5.8 ± 1.5) × 10(-9) (kV / cm)(-1).
The experimental result agrees well with relativistic, many-body theoretical predictions.
Previous central-field estimates were found to be an order of magnitude too large.

Conclusions:

The study successfully validates the precision of the (199)Hg EDM search apparatus.
The apparatus can resolve controlled, sub-nHz Larmor frequency shifts with EDM-like characteristics.
This work provides confidence in using this setup for future searches for permanent atomic electric dipole moments.