Author/Authors :
Fionov، نويسنده , , A.V. and Lund، نويسنده , , A. and Chen، نويسنده , , W.M. and Rozhkova، نويسنده , , N.N. and Buyanova، نويسنده , , I.A. and Emel’yanova، نويسنده , , G.I. and Gorlenko، نويسنده , , L.E. and Golubina، نويسنده , , E.V. and Lokteva، نويسنده , , E.S. and ?sawa، نويسنده , , E. and Lunin، نويسنده , , V.V.، نويسنده ,
Abstract :
Dispersed detonation nanodiamonds have been studied by continuous-wave (CW) and pulse EPR techniques. The spectrum of bulk radicals (g = 2.0025 ± 0.0002, a Lorentz line shape with ΔHpp = 0.95 ± 0.05 mT) dominated in CW EPR and prevented to record spectra from other paramagnetic species. The pulse EPR-spectrum was the superposition of the distorted P1-center spectrum with parameters (g = 2.0025, Axx = 2.57 mT, Ayy = 3.08 mT, Azz = 4.07 mT), the H1-center spectrum (g = 2.0028) and the single line (g = 2.0025, ΔHpp = 0.40 ± 0.05 mT) from other centers which may be assigned to surface radicals. The concentration of P1-centers has been estimated by CW EPR as 2 ± 1 ppm N.
