Summary
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 (3d 4 and 3d 6), 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.
Riassunto
Si riesaminano gli studi con l’EPR degli stati di quintetto di spin. Si espone un formalismo hamiltoniano effettivo generale perS=2 e lo si applica alla descrizione della struttura energetica fenomenologica degli stati di quintettö di spin. Si danno modelli microscopici per le costanti fenomenologiche di questo hamiltoniano per ioni paramagnetici (3d 4 e 3d 6), radicali liberi ed aggregati costituiti da ioni paramagnetici accoppiati per scambio. Si riserva particolare attenzione all’aggregato di quattro ioni di rame con spin effettivoS=2 in TGFB: Cu2+.
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Maćkowiak, M. Investigation of spin quintet states by electron paramagnetic resonance. Nuovo Cim B 29, 207–224 (1975). https://doi.org/10.1007/BF02732240
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DOI: https://doi.org/10.1007/BF02732240