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Precision measurement of weak transitions from excited states in helium by counting ultracold atoms
Author(s): J. A. Ross; K. F. Thomas; B. M. Henson; S. S. Hodgman; A. Truscott; K. G. H. Baldwin
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Paper Abstract

The advancing precision of modern atomic spectroscopy is beginning to afford optical tests of fundamental physics in helium through, for instance, nuclear charge radii determinations. Helium therefore provides a testbed as appealing as Hydrogen for spectroscopic tests of QED. Among outstanding discrepancies between predicted and observed Helium transition lines are the 7.5σ difference in the n = 3 singlet-triplet splitting and the 93σ difference between Martin’s measurements of the 23P2 → 53S1 and 23P2 → 53D transitions values, and recent predictions by Drake [3]. We contribute to both of these by measuring five transitions from the 23P2 state, improving on Martin’s measurements with an order of magnitude greater precision, and making the first observation of the spin-forbidden 23P2 → 51D2 transition in Helium. Our measurements constrain the 53D and 51D ionization energies of 4He[4] to 150 parts per billion, and the 53S to 28 parts per billion.

Paper Details

Date Published: 30 December 2019
PDF: 2 pages
Proc. SPIE 11200, AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019, 112002H (30 December 2019); doi: 10.1117/12.2557696
Show Author Affiliations
J. A. Ross, The Australian National Univ. (Australia)
K. F. Thomas, The Australian National Univ. (Australia)
B. M. Henson, The Australian National Univ. (Australia)
S. S. Hodgman, The Australian National Univ. (Australia)
A. Truscott, The Australian National Univ. (Australia)
K. G. H. Baldwin, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 11200:
AOS Australian Conference on Optical Fibre Technology (ACOFT) and Australian Conference on Optics, Lasers, and Spectroscopy (ACOLS) 2019
Arnan Mitchell; Halina Rubinsztein-Dunlop, Editor(s)

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