Hanneke D, Fogwell S, Gabrielse G
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Phys Rev Lett. 2008 Mar 28;100(12):120801. doi: 10.1103/PhysRevLett.100.120801. Epub 2008 Mar 26.
A measurement using a one-electron quantum cyclotron gives the electron magnetic moment in Bohr magnetons, g/2=1.001 159 652 180 73 (28) [0.28 ppt], with an uncertainty 2.7 and 15 times smaller than for previous measurements in 2006 and 1987. The electron is used as a magnetometer to allow line shape statistics to accumulate, and its spontaneous emission rate determines the correction for its interaction with a cylindrical trap cavity. The new measurement and QED theory determine the fine structure constant, with alpha{-1}=137.035 999 084 (51) [0.37 ppb], and an uncertainty 20 times smaller than for any independent determination of alpha.
使用单电子量子回旋加速器进行的测量给出了以玻尔磁子为单位的电子磁矩，g/2 = 1.00115965218073(28)[0.28 万亿分之一]，其不确定度比 2006 年和 1987 年的先前测量值小 2.7 倍和 15 倍。电子被用作磁力计以积累线形统计数据，其自发发射率决定了其与圆柱形陷阱腔相互作用的校正。新的测量和量子电动力学理论确定了精细结构常数，α⁻¹ = 137.035999084(51)[0.37 十亿分之一]，不确定度比α的任何独立测定值小 20 倍。
