Magnetic moment of electron spin

However, the magnetic moment of electron spin bears a different relation to the spin angular momentum it is approximately twice as great. This can be expressed by saying that the Land6 g-iactor for orbital motion of the electron is l and that for spin of the electron is 2. 

In a static magnetic field, each unpaired electron-spin of a free radical precesses about the axis parallel or antiparallel to the magnetic field (z-direction). The quantum state of the electron spin is expressed by a or p corresponding to these precessions. The population of the P spin state is larger than that of the a state by a Boltzman factor under the thermal equilibrium condition. so that the spin system has a total magnetization along the z-axis. The x-and y-components of the magnetic moments of electron spins are cancelled out under the thermal equilibrium condition because of the incoherence of the precession motion. 

The continuous sinusoidal composition change that occurs during spinodal decomposition can be considered to be a modulation of the solid structure. It is now known that many structures employ modulation in response to compositional or crystallographic variations, and in such cases the material flexibly accommodates changes without recourse to defect populations. (Other modulations, in, for example, magnetic moments or electron spins, although important, will not be discussed here.)... 

The Breit equation a) is invariant with respect to the Lorentz transformation b) takes into account the interaction of the magnetic moments of electrons resulting from their orbital motion c) neglects the interaction of the spin magnetic moments d) describes only a single particle. 

Next we shall consider the interaction between nuclear spin and the orbital magnetic moment of electrons. Let the position... 

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