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atomic constant comparison table

Subject	is named after	has unit	has proposal date	has uncertainty	has definition	has equation	has historical origin	has symbol	has value	represent	has proposer	is an instance of	is a unit of
Bohr radius	Niels Bohr		1928	0.0000000019 × 10-10 m	A unit of length based on the radius of the first Bohr orbit of hydrogen 1.			a0	0.5291772083 × 10-10 m		Hartree	radius	length
classical electron radius				0.00000031 × 10-15 m				re	2.817940285 × 10-15 m			radius
Fermi coupling constant				0.00001 × 10-5 GeV-2				Gf/(hc)3	1.16639 × 10-5 GeV-2			atomic constant
fine-structure constant				0.000000027 × 10-3	A coupling constant e2 / h bar c, approximately equal to 1/137 (where e is the electron charge, h bar is Plancks constant, and c is the speed of light), that measures the strength of the interaction between a charged particle and the electromagnetic field.			α	7.297352533 × 10-3			atomic constant
Hartree energy		energy unit		0.00000034 × 10-18 J				Eh	4.35974381 × 10-18 J			energy
quantum of circulation				0.000000027 × 10-4 m2 s-1				h/2me	3.636947516 × 10-4 m2 s-1			atomic constant
Rydberg constant				0.000083 m-1				R∞	10973731.568549 m-1			atomic constant
Thomson cross section				0.000000015 × 10-28 m2				σe	0.665245854 × 10-28 m2			area
weak mixing angle				0.0019				sin2θW	0.2224			atomic constant

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