PARAMAGNETIC CENTERS IN TETRAHEDRAL AMORPHOUS-CARBON

In this paper we report about the Electron Spin Resonance signal of te trahedral amorphous carbon deposited by a Filtered Cathodic Vacuum Are . We found that two types of non-interacting defects exist. Defects of one type, giving rise to a lorentzian line-shape, are probably cluste red. Defects of the other type, giving rise to a gaussian component, a re diluted in the network and their behaviour is affected by the local disorder. A discussion about spin-spin and spin-lattice relaxation ti mes is presented and the origin of the low spin-lattice relaxation tim e discussed. (C) 1997 Elsevier Science S.A.