Methods of Measuring Alpha Precisely

 

1.   Quantum Hall Effect, 24ppb
   
2.   a.c. Josephson Effect, 40ppb
   
3.   g-2, e^±, µ^±, QED 4ppb
   
4.   µ_hfs, 57 ppb
   
5.   Slow Neutron de Broglie Wavelength, 24ppb
   
6.   Cesium Mass and Recoil Velocity, 0.5?ppb
   

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