ENDOR OF THE P2 CENTER IN TYPE-IA DIAMONDS

The P2 centre was the first defect observed in diamond with electron s pin resonance. Because of a very complicated ESR spectrum many years e lapsed before the correct model was determined. Accurate spin Hamilton ian parameters have been determined from extensive ENDOR measurements at room temperature. These parameters are consistent with a model in w hich the defect consists of three nitrogens plus a vacancy. The observ ed ENDOR transitions do not follow the normal selection rules, and it will be explained how it can be predicted what frequencies will presen t in the ENDOR spectra.