Heydarizadmotlagh F, Skinner T D G, Kato K, George M C, Hessels E A
Department of Physics and Astronomy, York University, Toronto, Ontario M3J 1P3, Canada.
Phys Rev Lett. 2024 Apr 19;132(16):163001. doi: 10.1103/PhysRevLett.132.163001.
Increasing accuracy of the theory and experiment of the n=2 ^{3}P fine structure of helium has allowed for increasingly precise tests of quantum electrodynamics (QED), determinations of the fine-structure constant α, and limitations on possible beyond the standard model physics. Here we present a 2 ppb measurement of the J=1 to J=0 interval. The measurement is performed using frequency-offset separated-oscillatory fields. Our result of 29 616 955 018(60) Hz represents a landmark for helium fine-structure measurements, and, for the first time, will allow for a 1-ppb determination of the fine-structure constant when QED theory for the interval is improved.
氦原子n = 2³P精细结构理论与实验精度的提高，使得量子电动力学（QED）的测试越来越精确，精细结构常数α的测定越来越准确，同时也限制了可能超出标准模型的物理学。在此，我们给出了J = 1到J = 0区间2 ppb的测量结果。该测量是使用频率偏移分离振荡场进行的。我们得到的29 616 955 018(60) Hz的结果是氦精细结构测量的一个里程碑，并且当该区间的QED理论得到改进时，首次将允许对精细结构常数进行1 ppb的测定。
