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The Weiss magneton was experimentally derived in 1911 as a unit of magnetic moment equal to 1.53 × 10 −24 joules per tesla, which is about 20% of the Bohr magneton. In the summer of 1913, the values for the natural units of atomic angular momentum and magnetic moment were obtained by the Danish physicist Niels Bohr as a consequence of his ...
Here g L is the electron orbital g-factor and μ B is the Bohr magneton. The value of g L is exactly equal to one, by a quantum-mechanical argument analogous to the derivation of the classical gyromagnetic ratio.
The best available measurement for the value of the magnetic moment of the neutron is μ n = −1.913 042 76 (45) μ N. [3] [4] Here, μ N is the nuclear magneton, a standard unit for the magnetic moments of nuclear components, and μ B is the Bohr magneton, both being physical constants.
Bohr magneton: 9.274 010 0657 (29) ... is exactly known when expressed using the dalton (its value is exactly 1 Da), but the kilogram is not ...
The magnetic moment of the electron is =, where μ B is the Bohr magneton, S is electron spin, and the g-factor g S is 2 according to Dirac's theory, but due to quantum electrodynamic effects it is slightly larger in reality: 2.002 319 304 36.
Thirdly, the Landé g-factor, g J, is defined by | | = | | where μ J is the total magnetic moment resulting from both spin and orbital angular momentum of an electron, J = L + S is its total angular momentum, and μ B is the Bohr magneton. The value of g J is related to g L and g s by a quantum-mechanical argument; see the article Landé g-factor.
The above classical relation does not hold, giving the wrong result by the absolute value of the electron's g-factor, which is denoted g e: = | | =, where μ B is the Bohr magneton. The gyromagnetic ratio due to electron spin is twice that due to the orbiting of an electron.
The quantity μ eff is effectively dimensionless, but is often stated as in units of Bohr magneton (μ B). [12] For substances that obey the Curie law, the effective magnetic moment is independent of temperature. For other substances μ eff is temperature dependent, but the dependence is small if the Curie-Weiss law holds and the Curie ...