Abstract
The spectra of objects suffering extinction by diffuse interstellar dust contain a broad feature centered at ~3300 cm−1 (~3.0 μm), attributed to O-H stretching vibrations, and/or a feature near 2950 cm−1 (3.4 μm) attributed to C-H stretching vibrations. The 2950 cm−1 feature can be attributed to C-H stretching vibrations in the -CH2- and -CH3 groups of a fairly complex carbonaceous material containing aliphatic functional groups.
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