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The carbon‐13 nuclear magnetic resonance spectra of jet samples from England and Spain resemble those of carbonaceous materials from lignitic and sub‐bituminous ranks. This characterization is based on the aromatic/aliphatic ratio of resonances and on the pattern of fine structure. Particularly characteristic of jet is the well‐defined fine structure in the aromatic region that may be attributed to phenolic functionalities. This fine structure is found in all English and Spanish samples. Resonances from rapidly moving methyl groups are found in English but not in Spanish samples and may provide a means of distinguishing provenance.
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