Abstract
It is shown that forbidden hyperfine transitions of non-zero intensity are not observable for the Zeeman field orientation along the two-fold symmetry axis, when it is parallel to a crystal-field axis, of paramagnetic complexes, characterized by monoclinic site symmetry; on the other hand, they are observable for all orientations of the Zeeman field for complexes characterized by triclinic symmetry. Under the assumptions of isotropic hyperfine tensor and vanishing nuclear quadrupole interaction expressions are given for the intensities of the forbidden hyperfine transitions (ΔM=±1, Δm=±1; M and m are the electronic and nuclear magnetic quantum numbers, respectively), relative to those of the allowed hyperfine transitions (ΔM=±1, Δm=0) for an arbitrary Zeeman-field orientation. The three cases, where the monoclinic symmetry axis is parallel to a crystal-field (magnetic) axis have been specifically considered.
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