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The Interstellar C-H Stretching Band Near 3.4 μm: Constraints on the Composition of Organic Material in the Diffuse ISM

  • S. A. Sandford (a1), L. J. Allamandola (a1), A. G. G. M. Tielens (a1), K. Sellgren (a2), M. Tapia (a3) and Y. Pendleton (a1)...

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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References

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Sandford, S.A., Allamandola, L.J., Tielens, A.G.G.M., Sellgren, K., Tapia, M., and Pendleton, Y. (1991) ‘The interstellar C-H stretching band near 3.4 microns: Constraints on the composition of organic material in the diffuse interstellar medium’, Astrophys. J. 371, 607620.

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