![]() ![]() ![]() This suggests that the nitrogen in NPD is distributed in aggregated forms. ![]() The characteristic absorption due to the presence of an isolated form of nitrogen around 500 nm is not confirmed in NPD, in contrast to Ib-type synthetic diamond, although secondary ion mass spectrometry analyses revealed that NPD contains 50-100 ppm nitrogen atoms. On the other hand, the sharp decrease in the transmittance of NPD below about 500 nm is caused by the absorption due to the electron transition from A color center to the conduction band, as is the case for natural Ia-type diamond. (b) The corresponding transmittance of the various diamonds in the infrared regions. (a) Transmittance of the light around the ultraviolet-visible regions for some synthetic and natural single crystals and for NPD. Optical and IR spectra of NPD (after Sumiya et al., 2009).
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