The acoustic paramagnetic resonance spectrum of chromous ions in magnesium oxide

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Abstract
The acoustic paramagnetic resonance spectrum of the chromous ion as an impurity in magnesium oxide has tetragonal symmetry. There are three sets of chromous ions each giving a spectrum with its fourfold axis of symmetry along a direction in the magnesium oxide. The three sets of ions can be aligned by the application of external uniaxial compression. The results are consistent with the chromous ion undergoing a dynamic Jahn-Teller effect and there being a distortion from cubic symmetry at each chromous ion site due to random internal strains in the crystal.