Ultrahigh-precision measurement of the $n=2$ triplet P fine structure of atomic helium using frequency-offset separated oscillatory fields

Abstract

For decades, improved theory and experiment of the $n=2$ ${}^3$P fine structure of helium have allowed for increasingly-precise tests of quantum electrodynamics, determinations of the fine-structure constant $\alpha$, and limitations on possible beyond-the-Standard-Model physics. Here we use the new frequency-offset separated-oscillatory-fields (FOSOF) technique to measure the $2^3$P${}_2\to 2^3$P${}_1$ interval. Our result of $2291176590(25)$~Hz represents a major step forward in precision for helium fine-structure measurements.

References in corpus (15)

• New Measurement of the Electron Magnetic Moment and the Fine Structure Constant
• Measurement of the fine-structure constant as a test of the Standard Model
• New determination of the fine structure constant and test of the quantum electrodynamics
• Tenth-Order QED Contribution to the Electron g-2 and an Improved Value of the Fine Structure Constant
• Revised and Improved Value of the QED Tenth-Order Electron Anomalous Magnetic Moment
• High-precision calculation of the 4-loop contribution to the electron g-2 in QED
• Fine structure of helium-like ions and determination of the fine structure constant
• Testing fundamental interactions on the helium atom
• Light Weakly Coupled Axial Forces: Models, Constraints, and Projections
• Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy
• A Determination of the Fine Structure Constant using Precision Measurements of Helium Fine Structure
• Improved theory of helium fine structure
• Reexamination of helium fine structure
• Helium fine structure theory for determination of α
• Fine structure of helium and light helium-like ions

Cited by in corpus (13)

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• Precision Measurements in Few-Electron Molecules: The Ionization Energy of Metastable ${}^4$He${}_2$ and the First Rotational Interval of ${}^4$He${{}_2}^{+}$
• Atomic structure calculations of helium with correlated exponential functions
• Nonradiative ${\alpha }^{7}m$ QED effects in Lamb shift of helium triplet states
• Radiative ${\mathbf{\alpha }}^7\mathbf{m}$ QED contribution to the helium Lamb shift
• QED calculation of ionization energies of $1snd$ states in helium
• Quantum electrodynamic corrections to the $1s3d$ states of the helium atom
• Direct Measurement of the Forbidden $2^3{S}_1\to 3^3{S}_1$ Atomic Transition in Helium
• Relativistic corrections to the thermal interaction of bound particles
• Proposal for suppressing ac Stark shift in the He($2{}^3{S}_1\to 3{}^3{S}_1$) two-photon transition using magic wavelengths
• Vertex-type thermal correction to the one-photon transition rates
• Frequency measurements of transitions from the $2^3{P}_2$ state to the $5^1{D}_2$, $5^3{S}_1$, and $5^{3}D$ states in ultracold helium