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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