Measurement of the Frequency of the 2 ^{3}S-2 ^{3}P Transition of ^{4}He

X Zheng; Y R Sun; J-J Chen; W Jiang; K Pachucki; S-M Hu

doi:10.1103/PhysRevLett.119.263002

Measurement of the Frequency of the 2 ^{3}S-2 ^{3}P Transition of ^{4}He

Phys Rev Lett. 2017 Dec 29;119(26):263002. doi: 10.1103/PhysRevLett.119.263002. Epub 2017 Dec 28.

Authors

X Zheng^{1

2}, Y R Sun^{1

2}, J-J Chen¹, W Jiang², K Pachucki³, S-M Hu^{1

2}

Affiliations

¹ Hefei National Laboratory for Physical Sciences and Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China.
² CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
³ Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.

PMID: 29328711
DOI: 10.1103/PhysRevLett.119.263002

Abstract

The 2 ^{3}S-2 ^{3}P transition of ^{4}He was measured by comb-linked laser spectroscopy using a transverse-cooled atomic beam. The centroid frequency was determined to be 276 736 495 600.0(1.4) kHz, with a fractional uncertainty of 5.1×10^{-12}. This value is not only more accurate but also differs by as much as -49.5 kHz (20σ) from the previous result given by [Cancio Pastor et al., Phys. Rev. Lett. 92, 023001 (2004)PRLTAO0031-900710.1103/PhysRevLett.92.023001; Cancio Pastor et al.Phys. Rev. Lett.97, 139903(E) (2006)10.1103/PhysRevLett.97.139903; Cancio Pastor et al.Phys. Rev. Lett.108, 143001 (2012)10.1103/PhysRevLett.108.143001]. In combination with ongoing theoretical calculations, this work may allow the most accurate determination of the nuclear charge radius of helium.