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- W2046674906 abstract "Diamonds containing nitrogen in different forms have been irradiated by $3text{--}mathrm{MeV}$ electrons or $^{60}mathrm{Co}$ gamma photons and characterized by optical absorption (OA) and electron spin resonance (ESR). An unusually low production rate of vacancies $(V)$ and interstitials $(I)$ was observed in gamma-irradiated Ib-type diamonds (those containing isolated nitrogen) and pure IIa-type diamonds as compared to Ia diamonds (containing nitrogen clusters). Postirradiation annealing at temperatures above $300ifmmode^circelsetextdegreefi{}mathrm{C}$ strongly increased the $V$ and $I$ concentrations in Ib diamond, but not in IIa diamond. These results are explained as gamma irradiation of diamond predominantly produces $Vtext{--}I$ complexes instead of individual $V$ and $I$ defects. Strong effect of charge state on $Vtext{--}I$ recombination is revealed: In Ib diamond, $Vtext{--}I$ complexes are negatively charged and dissociate upon annealing. On the contrary, $Vtext{--}I$ pairs are neutral in IIa diamond, and they annihilate during irradiation. The OA, ESR, and positron annihilation signatures of the ${V}^{ensuremath{-}}text{--}I$ pairs are identified." @default.
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- W2046674906 date "2005-06-06" @default.
- W2046674906 modified "2023-10-18" @default.
- W2046674906 title "Evidence for vacancy-interstitial pairs in Ib-type diamond" @default.
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- W2046674906 doi "https://doi.org/10.1103/physrevb.71.233201" @default.
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