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Updated: Jul 24, 2025

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
An improved bound on the electron's electric dipole moment
Tanya S Roussy1,2, Luke Caldwell1,2, Trevor Wright1,2
1JILA, NIST and University of Colorado, Boulder, CO 80309, USA.
Abstract:
The imbalance of matter and antimatter in our Universe provides compelling motivation to search for undiscovered particles that violate charge-parity symmetry. Interactions with vacuum fluctuations of the fields associated with these new particles will induce an electric dipole moment of the electron (eEDM). We present the most precise measurement yet of the eEDM using electrons confined inside molecular ions, subjected to a huge intramolecular electric field, and evolving coherently for up to 3 seconds. Our result is consistent with zero and improves on the previous best upper bound by a factor of ~2.4. Our results provide constraints on broad classes of new physics above [Formula: see text] electron volts, beyond the direct reach of the current particle colliders or those likely to be available in the coming decades.
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