Absorption and luminescence studies of synthetic diamond in which the nitrogen has been aggregated

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Abstract
Absorption and cathodoluminescence spectra have been obtained from synthetic diamonds which have been heated at temperatures between 1700 and 2400 degrees C to produce various degrees of nitrogen aggregation. At the lower temperatures a number of optical centres attributed to nitrogen in intermediate stages of aggregation are observed; at the highest temperatures most of the nitrogen is present in the A-aggregate form with a small fraction in the B-aggregate form. The relative intensities of the Hib and Hic absorption lines in the near-infrared spectral region around 2 mu m provide a sensitive indication of the A- to B-nitrogen ratio. Although most of the nitrogen is present in aggregated form following these high-temperature treatments, the absorption and luminescence spectra are very different from those observed for natural type-Ia diamonds.

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