Constants > Physics > Subatomic Particles

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NAME SYMBOL VALUE
Electron-Neutron Magnetic Moment Ratio µen 960.92050(23) 
Electron-Neutron Mass Ratio me/mn 5.438673462(12) × 10-4 
Electron-Proton Magnetic Moment Ratio µep -658.2106875(66) 
Electron-Proton Mass Ratio me/mp 5.446170232(12) × 10-4 
Electron-Tau Mass Ratio me/mτ 2.87555(47) × 10-4 
Energy, Hartree Eh 4.35974381(34) × 10-18 J
27.2113834(11) eV
Fine Structure Constant α 7.297352533(27) × 10-3 
g-Factor, Electron ge -2.0023193043737(82) 
g-Factor, Muon gµ -2.0023318320(13) 
g-Factor, Neutron 2µnN gn -3.82608545(90) 

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