Direct Measurement of the Forbidden 2^{3}S_{1}→3^{3}S_{1} Atomic Transition in Helium

Physical Review Letters
K F ThomasA G Truscott

Abstract

We present the detection of the highly forbidden 2^{3}S_{1}→3^{3}S_{1} atomic transition in helium, the weakest transition observed in any neutral atom. Our measurements of the transition frequency, upper state lifetime, and transition strength agree well with published theoretical values and can lead to tests of both QED contributions and different QED frameworks. To measure such a weak transition, we develop two methods using ultracold metastable (2^{3}S_{1}) helium atoms: low background direct detection of excited then decayed atoms for sensitive measurement of the transition frequency and lifetime, and a pulsed atom laser heating measurement for determining the transition strength. These methods could possibly be applied to other atoms, providing new tools in the search for ultraweak transitions and precision metrology.

References

Aug 1, 1988·Physical Review A: General Physics·C E Tanner, C Wieman
Feb 20, 2007·Optics Letters·P FendelT W Hänsch
Feb 1, 2008·Physical Review Letters·R G DallA G Truscott
Oct 2, 2009·Physical Review Letters·S S HodgmanA G Truscott
Jul 9, 2010·Nature·Randolf PohlFranz Kottmann
Sep 28, 2010·Physical Review Letters·Marc Smiciklas, David Shiner
Sep 28, 2010·Physical Review Letters·Dominik Z KandulaKjeld S E Eikema
Oct 14, 2010·Optics Express·A G ManningA G Truscott
May 1, 2012·Physical Review Letters·P Cancio PastorK Pachucki
Jan 31, 2014·Nature Communications·Yong WanPiet O Schmidt
Aug 15, 2015·Physical Review Letters·Florian GebertPiet O Schmidt
Jan 13, 2018·Physical Review Letters·X ZhengS-M Hu

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Citations

Nov 17, 2020·Physical Review Letters·Xiao-Qiu QiKe-Lin Gao

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