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Fourier transform infrared spectra of a suite of coals of varying rank from peat to anthracite were obtained via reflectance micro-FTIR and traditional KBr pellet techniques. With increasing rank of coal samples, KBr-FTIR spectra exhibit rising aromaticity (ratio of CH ar at 3000–3100 or 700–900cm −1 versus CH al at 2800–3000cm −1 ) and enhanced condensation of aromatic...