Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session F01: Poster Session I (4:00pm-6:00pm PT)
4:00 PM,
Tuesday, June 6, 2023
Room: Exhibit Hall C
Abstract: F01.00121 : Measuring the n=2 triplet P fine structure of atomic helium using frequency-offset separated oscillatory fields*
Presenter:
Farshad Heydarizadmotlagh
(York University)
Authors:
Farshad Heydarizadmotlagh
(York University)
Taylor D Skinner
(York Univ)
Kosuke Kato
(Univ of Toronto)
Matthew C George
(York Univ)
Eric A Hessels
(York University)
The method [1] of Frequency-Offset Separated Oscillatory Fields (FOSOF) is used to perform
the measurements. The measurement of the J=1-to-J=2 interval has been completed [2], with a
measurement uncertainty of only 25 Hz. The measurement of the 29.6-GHz J=0-to-J=1 interval
is nearing completion. These measurements, together with sufficiently precise theoretical
predictions for the intervals (see [3] for the current state-of-the-art calculations) can be used to
determine a value for the fine-structure constant and to test for possible physics beyond the
standard model.
[1] A. C. Vutha and E. A. Hessels, Phys. Rev. A 92, 052504 (2015).
[2] K. Kato, T. D. G. Skinner and E. A. Hessels, Phys. Rev. Lett. 121, 143002 (2018).
[3] K. Pachucki and V. A. Yerokhin, Phys. Rev. Lett. 104, 070403 (2010).
*This work is funded by NSERC, CFI and ORF.
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