A derivation of the time dependence of the cluster of two spins

Abstract
Time-dependent perturbation theory is used to calculate the probabilities for the states and their transitions of a cluster of two spins. The time dependence is included in the boundary conditions which are used as described in a recent paper by Bolton and Johnson (1976). The ideas are tested briefly on the simple mean-field case. The structure of the transition probabilities suggested by Suzuki and Kubo (1968) is verified with expressions dependent on the nature of the coupling between the lattice and the spins.

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