A theoretical method for investigating the inter-relation between the electronic and the molecular structures of a 3d(5) ion in a tetragonal ligand-field has been established on the basis of a 252×252 complete energy matrix. By means of this method, the local lattice structures of Mn(2+) in two different tetragonal sites in Cs2NaLaCl6 elpasolite are determined by the experimental EPR spectra. The Mn(2+)-Cl(-) distances have been obtained as: R1=3.2803Å, R2=2.6495Å for (MnCl6)La cluster, and R1=3.4558Å, R2=2.5111Å for (MnCl6)Na cluster in the Cs2NaLaCl6:Mn(2+) system. And our results show R1>R2 for each cluster, which exhibits an elongation distortion relative to the regular octahedron. And the elongation magnitude of a tetragonal (MnCl6)Na cluster is larger than that of a (MnCl6)La cluster in the Cs2NaLaCl6:Mn(2+) system. Using this method, our calculation values of EPR parameters are well accordant with the experimental values.
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