New Measurement of the Electron Magnetic Moment and the Fine Structure Constant

Details New Measurement of the Electron Magnetic Moment and the Fine Structure Constant New Measurement of the Electron Magnetic Moment and the Fine Structure Constant

2008-01-07

arxiv.org/abs/0801.1134v2

Phys.Rev.Lett.100:120801,2008

Physics

Atomic Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.120801

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 lineshape 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.

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