Abstract
A typical relaxation mechanism is studied for which the change in magnetic energy, accompanying a spin flip, is compensated or partly compensated by the change in electric energy. The spin flips are all two or more spin processes for this mechanism. An essential part of the argument is the partition of the operators of the total magnetic moment and of the total spin moment in a diagonal and a non-diagonal part, in a representation diagonalizing the zero order hamiltonian, containing only the one spin parts of the total spin hamiltonian (Zeeman parts and electric parts). Only the diagonal part of the moments contribute to the spin-spin relaxation. Just as for the more simple case, treated in previous papers 1) 2), the number of relaxation times equals the number of groups of ions. Most attention will be paid to simple systems, containing only one group.
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