Abstract
Paramagnetic resonance has been observed in Mn 2+ , Eu 2+ and Gd 3+ ions in single crystals of calcium fluoride grown from the melt. The Mn 2+ ion has a very small cubic-field Stark splitting ( a = + 0.6 ± 0.4 x 10 -4 cm -1 ), and a fluorine hyperfine structure of overall splitting of about 60G due to some covalent bonding with the fluorine ligands. The Eu 2+ spectrum has cubic symmetry with splitting parameters b 4 = 57.9 + 0.2, b 6 = 0.5 + 0.2 ( x 10 -4 cm -1 ), but the Gd 3+ spectrum has tetragonal symmetry with much larger Stark splittings; neither ion shows a resolved fluorine structure. The manganese and europium hyperfine structures are closely the same as in other salts with small covalent bonding.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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