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The local lattice structure and electron paramagnetic resonance (EPR) spectra have been studied systematically by diagonalizing 364×364 complete energy matrices for a f 11 ion in a trigonal ligand-field. By simulating the calculated Stark levels and EPR parameters to the experimental results, the shift parameters are determined for Er 3+ ions in BaF 2 and SrF 2 . The...
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