Abstract
Abstract The hyperfine electron-nuclear interaction in antiferromagnetic rhombic binuclear exchange clusters in the triplet state ( S = 1) is considered. The second-order corrections to the hyperfine energy levels and the probabilities of allowed (Δ M = 1, Δ m 1 + Δ m 2 = 0) and different types of forbidden (Δ M = 1, 2; Δ m 1 + Δ m 2 = 0, 1, 2) EPR transitions for canonical orientations of the external magnetic field are calculated. It is shown that the relative line intensities of parallel low- and high-field fine transitions depend on the parameter of rhombicity E i . The hyperfine structure of the low-field transition is predicted to be equally spaced. The EPR spectra of {Cu[(CH 3 ) 2 CHCOO] 2 · 0.5C 4 H 8 O 2 ) 2 single crystals were studied and explained on the basis of the calculated results obtained.
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