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High resolution IR spectra of three coals of different rank (age) are reported in the range 400-500cm -1 using Diffuse Reflectance IR Fourier Transform (DRIFT) spectroscopy. High ranking coals provide the best fit to the interstellar IR spectra, including UIBs (Unidentified IR Bands) and continuum. IR bands are found not to be affected by temperature rise up to 700K but are progressively...
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