氦-4的2 ³S-2 ³P跃迁频率的测量

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

作者信息

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

机构信息

Hefei National Laboratory for Physical Sciences and Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China.

CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.

出版信息

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

DOI:10.1103/PhysRevLett.119.263002

PMID:29328711

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.

摘要

利用横向冷却原子束的梳状激光光谱法测量了⁴He的2³S - 2³P跃迁。确定质心频率为276736495600.0(1.4)kHz，分数不确定度为5.1×10⁻¹²。该值不仅更精确，而且与[坎西奥·帕斯托尔等人，《物理评论快报》92, 023001 (2004)；PRLTAO0031 - 900710.1103/PhysRevLett.92.023001；坎西奥·帕斯托尔等人，《物理评论快报》97, 139903(E) (2006)10.1103/PhysRevLett.97.139903；坎西奥·帕斯托尔等人，《物理评论快报》108, 143001 (2012)10.1103/PhysRevLett.108.143001]给出的先前结果相差高达 - 49.5 kHz(20σ)。结合正在进行的理论计算，这项工作可能会最精确地确定氦的核电荷半径。