摘要: Abstract The ESR spectrum of two defect centres were observed in finely ground diamond powders (0.5 to 30 μm size). one centre has been seen before irradiated and annealed single crystals natural diamonds (the O 1 centre) while the second only synthetic grown from a nickel-iron melt is observable below 250 K. From study variation intensity these lines with size particles it could be concluded that lies just beneath surface S at least 0.5 surface.
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