Constants > Physics > Subatomic Particles

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	NAME	SYMBOL	VALUE
	Compton Wavelength, Proton h/mpc	λC,p	1.321409847(10) × 10-15 m
	Compton Wavelength, Tau	λC,τ	0.69770(11) × 10-15 m
	Constant, Fine Structure	α	7.297352533(27) × 10-3
	Constant, Inverse Fine Structure	α	137.03599976(50) × 10-3
	Constants, Rydberg α2mec/2h	R∞ R∞c R∞hc	10973731.568549(83) m-1 3.289841960368(25) × 1015 Hz 2.17987190(17) × 10-18 J
	Cross Section, Thomson	σe	0.665245854(15) × 10-28 m2
	Deuteron Magnetic Moment	µd	0.43307375(15) × 10-26 J T-1 0.4669754479 × 10-3 µB 0.857438230(24) µN
	Deuteron Molar Mass	Md	2.013553214(24) u
	Deuteron Rest Mass	md	3.3435860(20) × 10-27 kg 2.013553214(24) u 1875.61339(57) MeV c-2
	Deuteron-Electron Magnetic Moment Ratio	µd/µe	0.4664345460(91) × 10-3
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