Electron paramagnetic resonance in low-temperature electron-irradiated diamond

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Abstract
A man-made boron doped diamond has been irradiated at 77 K with 1.5 MeV electrons. After irradiation an isotropic signal is observed which is composed of a central resonance at g = 2.00 and of a two line spectrum (A 7) split symmetrically 60 G from the central line. After sufficient annealing an additional two line spectrum (A 8) split symmetrically 33 G from the central line appears. The variation with dose and with isochronal annealing (up to 330 K) of these spectra is measured. Their annealing behaviour is correlated with previously published conductivity measurements, demonstrating that the A 7 and A 8 spectra are associated with the thermal deexcitation of traps present before irradiation and that an annealing stage of the central line at 250-300 K is associated with the recovery of irradiation-induced defects. The defects associated with these spectra have not been identified