Nuclear Bohr magneton

Here, /3 and / are constants known as the Bohr magneton and nuclear magneton, respectively g and gn are the electron and nuclear g factors a is the hyperfine coupling constant H is the external magnetic field while I and S are the nuclear and electron spin operators. The electronic g factor and the hyperfine constant are actually tensors, but for the hydrogen atom they may be treated, to a good approximation, as scalar quantities. 

The nuclear magneton is 1/1836th the Bohr magneton, due to the replacement of the electron s mass with the proton s mass. Nuclear magnetic moments are much smaller than the electron s magnetic moment. 

Note that the nuclear magneton is smaller than the Bohr magneton by the factor of the ratio of the proton to electron masses, 1840. 

Where (3 is the Bohr magneton, H0 is the applied magnetic field, g is the g-tensor, S is the electron spin, I is the nuclear spin, gn and (3n.are the nuclear splitting factor and the nuclear magneton. The hyperfine coupling tensor A consists of an isotropic contact interaction... 

The first two terms are Zeeman terms and the third represents the hyperfine interaction of the electron and nuclear spins, / b and are the Bohr and nuclear magnetons respectively, S is a fictitious effective spin (S = 2 for a simple Kramers doublet), and / is the nuclear spin tensor. The hyperfine tensor is further split into Fermi contact, dipolar, and orbital components according to ... 

Bohr magneton nuclear magneton Weiss magneton medium (spectra) meter... 

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