Physical Constant - Table of Atomic and Nuclear Constants

Table of Atomic and Nuclear Constants

Quantity Symbol Value (SI units) Relative Standard Uncertainty
Bohr radius 5.291 772 1092(17) × 10−11 m 3.2 × 10−9
classical electron radius 2.817 940 3267(27) × 10−15 m 9.7 × 10−10
electron mass 9.109 382 91(40) × 10−31 kg 4.4 × 10−8
Fermi coupling constant 1.166 364(5) × 10−5 GeV−2 4.3 × 10−6
fine-structure constant 7.297 352 5698(24) × 10−3 3.2 × 10−10
Hartree energy 4.359 744 34(19) × 10−18 J 4.4 × 10−8
proton mass 1.672 621 777(74) × 10−27 kg 4.4 × 10−8
quantum of circulation 3.636 947 5520(24) × 10−4 m² s−1 6.5 × 10−10
Rydberg constant 10 973 731.568 539(55) m−1 5.0 × 10−12
Thomson cross section 6.652 458 734(13) × 10−29 m² 1.9 × 10−9
weak mixing angle 0.2223(21) 9.5 × 10−3

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