Vibronic interactions can induce strong admixture by the magnetic field of other states into Kramers doublets leading to strong spin-lattice coupling of the Kramers doublets. The spin-lattice coefficients of the ground Γ₇ level of d⁹ ions in tetrahedral symmetry are calculated in the cases of strong and moderate Jahn-Teller coupling of the ²T₂ state to E modes of vibration. The electron paramagnetic resonance (EPR) of Cu²⁺ and Ag²⁺ in ZnS, ZnSe, and ZnTe is unobserved because of the strong spin-lattice coupling: the internal strains of the crystals are the cause of broadening of EPR lines thus too weak to be detected.
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Clerjaud et al. (1977) studied this question.
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