Abstract

EPR studies of spin quintet states are reviewed. A general effective Hamiltonian formalism forS=2 is given and applied to the phenomenological energy structure description of spin quintet states. Microscopic models for the phenomenological constants of this Hamiltonian are given for paramagnetic ions (3d4 and 3d6), free radicals and aggregates consisting of exchange-coupled paramagnetic ions. The fourcopper-ion aggregate with effective spinS=2 in TGFB: Cu2+ is given particular attention.

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