G-factor electron spin

The most important effect arising from quantum electrodynamics, which is quantitatively significant, is a correction to the electron spin g factor. Up to now the symbol gs has been taken to represent the Dirac g factor for the electron and to have the value of 2 exactly. As we mentioned earlier, quantum electrodynamics shows the existence of radiative corrections to this value, and the best theoretical value of gs, which agrees with experiment [19], is 2.002 32. 

The anisotropic corrections to the electron spin g-factor appear in (9.107) because of the admixture of excited electronic states with the3 ground state. 

The following electron spin g factors were obtained from ESR spectra of the PH2 radical isolated in various solid matrices ... 

Using the approximate value 2.0 for the electron spin g factor g results in the common expression [1]... 

Hence, using equation (3.84), show that this leads to a value for the electron spin g-factor of... 

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