Abstract

Pulsed, Fourier-transform, and continuous-wave electron paramagnetic resonance methods are used to study the g=2.0319 EPR signal in synthetic diamond crystals. This signal is from Ni which is found to be located at a substitutional site in the diamond lattice without detectable nearby charge compensation. The effective spin state of S=(3/2 is determined from Fourier-transform nutational EPR spectroscopy. It is proposed that the center is a ${\mathrm{Ni}}^{\mathrm{\ensuremath{-}}}$ ion with electronic configuration 3${\mathit{d}}^{7}$.

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