Abstract
An investigation was carried out to explore the importance of two line-broadening mechanisms which may be responsible for the width of the electron spin resonance signals exhibited by coals. Studies of catalytically dehydrogenated coals, isotopically substituted low-temperature chars, and a large number of vitrains from coals of all ranks support the view that electron-nuclear hyperfine interactions produce significant contributions to the e.s.r. linewidths found for low-rank coals. Anisotropic g-values appear to be relatively unimportant for low-rank coals, but measurements made on oriented sections of young anthracitic coals revealed a small but reproducible anisotropy in the e.s.r. g tensor.
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