| Summary: | The EPR spectrum of a synthetic diamond, containing a high concentration of isolated substitutional nitrogen, N-S (the P1 EPR centre), shows in addition to the spectrum of P1 three other features not previously observed in nitrogen containing diamond:1. an 'allowed' pair spectrum close to that of P1 corresponding to interacting pairs of N-S at three sites separated by 0.357-0.564 nm;2. a 'forbidden' pair spectrum at about half of the magnetic field required for P1, with hyperfine structure characteristic of a pair of interacting nuclei with I = 1, each with the same hyperfine parameters as P1: corresponding to a superposition of many pairs of separation greater than 0.7 nm;3. a double quantum spectrum of P1, being an exact replica of the normal spectrum at twice the magnetic field. (C) 1999 Elsevier Science S.A. All rights reserved.
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