13C,14N and15N ENDOR measurements on the single substitutional nitrogen centre (P1) in diamond

Abstract
New ENDOR measurements on the single substitutional nitrogen centre in diamond are reported. The CW-ENDOR mechanism utilizes cross relaxation, and measurements have been made on both 14N and 15N, as well as the first detailed 13C ENDOR study on the isotope at the natural abundance of 1.1%. The change in EPR intensity induced by driving the 13C nuclear transitions was approximately equal to 100% of the EPR intensity of the appropriate 13C hyperfine satellite. The assignment of 13C hyperfine coupling matrices with specific sites is considered, and predictions made about the signs of some of the 13C hyperfine interactions.
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