On the interrelation of the << oxygen effect >> in EPR spectra of carbonised materials with their porous structure

By cause of magnetic dipole-dipole interaction of O-2 molecules with carbon PMC as centres with different relaxation times, registration of EPR spectr a of carbon materials of the same carbonisation only in air atmosphere. doe s not provide necessary information in analysis of their structure. As mani festation of the <<oxygen effect>> depends on characteristics of the porous structure, EPR spectroscopy call be used for express-assessment of carboni sed materials as intermediate products in producing active carbons.