Positronium Hyperfine Interval Measured via Saturated Absorption Spectroscopy

Cassidy, D. B.; Hisakado, T H; Tom, H W K; Mills, A. P.

doi:10.1103/PhysRevLett.109.073401

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Positronium Hyperfine Interval Measured via Saturated Absorption Spectroscopy

Author(s): D. B. Cassidy , T. H. Hisakado , H. W. K. Tom , A. P. Mills

Publication date (Electronic): August 16 2012

Journal: Physical Review Letters

Publisher: American Physical Society (APS)

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Most cited references 52

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Fine Structure of the Hydrogen Atom by a Microwave Method

Willis Lamb, Robert Retherford (1947)

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On Quantum-Electrodynamics and the Magnetic Moment of the Electron

Julian Schwinger (1948)

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Is Open Access

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

, , (2010)

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.