EPR investigation of Eu2+ in orthorhombic sites of RbBr

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Abstract
Accurate spin‐Hamiltonian parameters describing the electron paramagnetic resonance spectra of Eu2+ in orthorhombic sites of RbBr single crystals have been determined at 77 and 300 K for the first time. Absolute signs of the spin‐Hamiltonian parameters were determined for sample temperatures less than 4.2 K. The sign of the spin‐Hamiltonian parameter b20 was found to be positive and therefore the same as that previously found for the same impurity in the isomorphic hosts of NaBr and KBr. We present a plot of the b20 term vs lattice parameter for Eu2+ ions in the alkali bromide series with results which should be noted in attempts to calculate theoretical 8S7/2 ground state splittings.

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