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The effect of 500 kev electron and neutron irradiation on the cathodoluminescence spectra of a number of natural diamonds excited by 70 kev electrons has been studied. In certain crystals a line system has been induced at 3940 A by 500 kev electron irradiation without annealing Further systems at 5030 A and 5755 Å appeared in all the crystals examined when electron or neutron irradiation was followed by vacuum annealing at temperatures between 600°C and 800°C. The effect of different annealing temperatures was also studied.
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J. E. Ralph (1960) studied this question.
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