Precision measurement of the n=2 triplet P J=1-to-J=0 fine structure of atomic helium using frequency-offset separated oscillatory fields

2023/10/25 by F. Heydarizadmotlagh, T. D. G. Skinner, Heydarizadmotlagh, F. +7 · 3 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic Physics (physics.atom-ph) #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Quantum, superfluid, helium dynamics

paper · pdf · doi:10.48550/arxiv.2310.17040

openalex publication_date 2023/10/25 · openalex created_date 2023/10/28 · openalex updated_date 2026/07/28

Abstract

Increasing accuracy of the theory and experiment of the n=2 ³P fine structure of helium has allowed for increasingly-precise tests of quantum electrodynamics (QED), determinations of the fine-structure constant α, and limitations on possible beyond-the-Standard-Model physics. Here we present a 2~part-per-billion (ppb) measurement of the J=1-to-J=0 interval. The measurement is performed using frequency-offset separated-oscillatory-fields. Our result of 29 616 955 018(60)~Hz represents a landmark for helium fine-structure measurements, and, for the first time, will allow for a 1-ppb determination of the fine-structure constant when QED theory for the interval is improved.

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