Identification of the di-nitrogen <001> split interstitial H1a in diamond

S Liggins, ME Newton, JP Goss, PR Briddon and D Fisher
Physical Review B

The structure of the defect responsible for the H1a absorption feature in diamond has been much debated. In this work, the results of uniaxial stress-splitting studies are compared to piezospectroscopic stress-splitting parameters calculated for the <001> di-nitrogen split interstitial (N2I) defect. The stress-splitting data shows that the H1a absorption band arises from an AE transition at a center with D2d symmetry. Furthermore, the experimentally and theoretically determined stress-splitting parameters are in excellent agreement, supporting the assignment of the H1a band to the N2I defect.

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