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Abstract
Infrared (IR) absorption measurements were performed at room temperature on neutron-irradiated type Ib diamonds which contain around 100 ppm substitutional nitrogen atoms in single form. It was observed that the 1332 cm −1 absorption peak appears by irradiation but vanishes again at the dose region higher than 2×10 18 n/cm 2. This phenomenon is explained by using two-step charge compensation model. Furthermore three remarkable peaks are observed at 1530 and 1570 cm −1 and at 1450 cm −1. Relations between absorption intensity and neutron dose of these peaks were studied. Intensity of these peaks increase linearly with dose; however, the 1450 cm −1 peak intensity saturates around 2×10 17 n/cm 2 in contrast with the others. These results are consistent with the interstitial models proposed previously.
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