Parallel-mode EPR spectra of the hexaaqua manganese(II) Ion in tetrahedral symmetry
2024
Juel Henrichsen, Margrete | Bendix, Jesper | Weihe, Høgni
Parallel-mode X-band EPR spectra of the manganese(II) hexaaqua ion as substitutional impurity in Cs[Mg(H2O)6]AsO4 are presented and interpreted. In this lattice the aqua ion, considering also the disposition of the hydrogen atoms, occupies a crystallographic site with tetrahedral symmetry. This rare situation enables that the line positions as well as the intensities in the parallel-mode EPR spectra can be modelled with a simple three-parameter cubic-symmetry spin Hamiltonian, including the isotropic Zeeman interaction ($g$) pertinent to the $S={5}/{2}$ electronic spin, the isotropic hyperfine interaction ($A$), between the electronic spin and the $I={5}/{2}$ nuclear spin, and the cubic splitting ($a$) of the $S={5}/{2}$ manifold. A simple formalism, based on perturbation theory to grossly account for the observed intensities, is presented. We observe all parallel-mode-allowed hyperfine transitions associated with all fine-structure transitions.
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