Evaluation of magnetic parameters

When the energy of the system depends upon the magnetic field B, electron spin S and nuclear spins 7y, the set ofmagneticparameters is covered by the second-rank tensors ic, D, Ag, oN, TN and KNM. These are the reduced magnetic parameters, interrelated with the observed (measured) quantities according to Table 5.1. 

Each magnetic parameter is received as a second derivative of the total energy with respect to the pertinent variables [1]. The total energy can be viewed as an expectation value of the molecular Hamiltonian which includes all the interaction terms. Some of the Hamiltonian terms were constructed on the basis of non-relativistic quantum theory. It should be noticed, however, that the relativistic quantum theory brings new terms which are usually truncated at the cut-off of 1/c2. 

To evaluate the magnetic parameters several methods have been developed (Table 5.2)  

Meaning Reduced parameter Observed (measured) parameter3 

Method Perturbation theory Gauge factors Problems 

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This has a close relationship to the evaluation of magnetic parameters for example, X may by a component of the magnetic field and k may represent a component of the spin magnetic moment. 

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