Abstract
The use of the paramagnetic resonance method for the determination of the structure of point defects in alkaline earth fluoride crystals is described. The F centre (an electron trapped at an anion vacancy) and the M centre (two nearest-neighbour F centres) have been investigated. In the case of the M centre, the ground state (1Σ) is not paramagnetic, and EPR measurements have been made on the first excited state (3Σ), which is populated by optical means. Paramagnetic resonance measurements have been made on the 2Σ ground state of the self-trapped hole, and correlated optical and EPR measurements on this centre are described. It is shown that knowledge of the electronic structure of point defects provides routes to the investigation of crystal band structures.
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