Abstract
Electron paramagnetic resonance (EPR) spectroscopy was used to analyse properties of paramagnetic centres systems of the samples separated from two lithotypes of Polish coal (85.6wt% C). The EPR spectra of the durain samples with a content of 2–22vol.% exinite, 73–86vol.% vitrinite and 5–17vol.% inertinite, and the clarain samples with a content of 3–14vol.% exinite, 65–90vol.% vitrinite and 4–32vol.% inertinite were compared. Three different groups of paramagnetic centres in each of the coal samples were found. The concentration of unpaired electrons and the parameters of the resonance absorption curves: linewidths and g-factor, were determined.
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