Moment magnetic of electron

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 principal magnetic properties of polymers are the diamagnetic susceptibility and the magnetic resonance. The former is a property of the material as a whole the latter is connected with magnetic moments of electrons and nuclei within the material. 

The operators of the magnetic moments of electron and of the nucleus read... 

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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