Spectroscopy of diamond plates modified by electron beams

Five monocrystalline type Ib plates with nitrogen nitrogen from 9 to 106 ppm, were irradiated with a dose of 10$^{18}$ e/cm$^2$ electrons with an energy of 3 Mev and were annealed in vacuum at a temperature of 1200$^\circ$С during 24 hours. The dependence of the resonance signal magnitude on changes in the concentration of substitutive nitrogen as a result of electron irradiation and subsequent annealing was found by infrared spectroscopy and optically detectable magnetic resonance.