MICROWAVE SATURATION OF EPR-SPECTRA OF VITRINITE AND PRODUCTS OF ITS PYRIDINE EXTRACTION

The influence of microwave saturation on e.p.r. lines of vitrinite and products of its pyridine extraction was investigated. E.p.r. spectra taken at higher microwave power have clearly revealed the complex structure of resonance absorption lines both for vitrinite and the residue. The best numerical approximation of e.p.r. spectra for both samples was obtained when two Lorentz and one Gauss curve were chosen for calculation. The values of the g-factor, the widths of the components and their fraction in the total spectrum were determined. The e.p.r. spectrum of the pyridine extract of vitrinite was fitted with a single line of Lorentz shape.