ENDOR of the P2 centre in type-Ia diamonds

Abstract
The P2 centre was the first defect observed in diamond with electron spin resonance. Because of a very complicated ESR spectrum many years elapsed before the correct model was determined. Accurate spin Hamiltonian parameters have been determined from extensive ENDOR measurements at room temperature. These parameters are consistent with a model in which the defect consists of three nitrogens plus a vacancy. The observed ENDOR transitions do not follow the normal selection rules, and it will be explained how it can be predicted what frequencies will present in the ENDOR spectra.

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