Abstract
The electron paramagnetic resonance (EPR) spectrum of a synthetic 0.15-carat diamond single crystal grown in a (Fe-Co-C) system using the temperature gradient method in a split-sphere type apparatus has been studied. It is established that the EPR signal from P1 centers (representing nitrogen atoms occurring at the C sites) present in the diamond crystal upon a high-temperature high-pressure (HTHP) treatment exhibits inversion when the microwave power in an H102 resonator is increased from 70 μW to 70 mW at a polarizing magnetic field scan rate from 0.5 to 5 mT/min. No such inversion is observed in the initial diamond (before the HTHP treatment).
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