A coal model for the carriers of the unidentified IR bands

Astronomy and Astrophysics – Astronomy

Scientific paper

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Absorption Spectra, Bandwidth, Carbonaceous Materials, Coal, Infrared Spectra, Interstellar Matter, Molecular Spectra, Astronomical Spectroscopy, Emission Spectra, Infrared Spectroscopy, Molecules

Scientific paper

The unidentified infrared bands are analyzed on the basis of the vitrinite absorbance spectrum. Vitrinite is the organic and major component of coal. Each of the unidentified infrared bands has its counterpart in the vitrinite spectra, which also exhibit a continuum rising toward the blue. The better fit provided by vitrinite over other models is due to the presence of oxygen, as well as hydrogen, in the form of surface functional groups bonded to a bulk, disordered, carbon structure with aliphatic as well as aromatic bonds. The infrared spectrum of vitrinite is analyzed and a comparison with the unidentified bands is carried out.

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