EPR investigations of Eu2+ in orthorhombic sites of NaCl

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Abstract
Spin‐Hamiltonian parameters describing the EPR spectrum of Eu2+ in orthorhombic sites of NaCl single crystals have been determined at 77 and 300 K. Previously undetermined absolute signs of the parameters were deduced from observations of relative line intensities at liquid helium temperatures. The sign of the second‐order spin‐Hamiltonian parameter b20 was found to be positive and is therefore in agreement with the sign reported by Nair et al. for Eu2+ in KCl. Previously proposed models for the orthorhombic Eu2+ defects in alkali halides are discussed.