Odom B, Hanneke D, D'Urso B, Gabrielse G
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2006 Jul 21;97(3):030801. doi: 10.1103/PhysRevLett.97.030801. Epub 2006 Jul 17.
A new measurement resolves cyclotron and spin levels for a single-electron quantum cyclotron to obtain an electron magnetic moment, given by g/2=1.001 159 652 180 85 (76) [0.76 ppt]. The uncertainty is nearly 6 times lower than in the past, and g is shifted downward by 1.7 standard deviations. The new g, with a quantum electrodynamics (QED) calculation, determines the fine structure constant with a 0.7 ppb uncertainty--10 times smaller than for atom-recoil determinations. Remarkably, this 100 mK measurement probes for internal electron structure at 130 GeV.
一种新的测量方法解析了单电子量子回旋加速器的回旋加速器能级和自旋能级，以获得电子磁矩，其值为g/2 = 1.001 159 652 180 85 (76) [0.76 万亿分之一]。不确定性比过去降低了近6倍，并且g值向下偏移了1.7个标准差。新的g值结合量子电动力学（QED）计算，确定了精细结构常数，不确定性为0.7 ppb，比原子反冲测定法小10倍。值得注意的是，这项在100 mK下的测量探测了130 GeV的内部电子结构。
