Studies by electron paramagnetic resonance of K- and Na- bromides doped with Eu2+

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Abstract
The electron paramagnetic resonance of Eu2+ in orthorhombic sites of NaBr and KBr has been observed at 1.2 and 300 K using an X−band spectrometer. The spin−Hamiltonian parameters for Eu2+ ions in NaBr have been determined for the first time. Some disagreement between the results obtained at room temperature and those reported recently by other workers for the KBr host is noted. Absolute signs of the spin−Hamiltonian parameters were determined from the relative intensities of the resonance lines at liquid helium temperatures. In both studies the sign of the b02 term was found to be positive, and is therefore in agreement with the sign reported by Nair et al. for Eu2+ in KCl and by Aguilar et al. for Eu2+ in NaCl. The behavior of the second−order spin−Hamiltonian paramerer b02 as a function of the lattice size is discussed.

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