| Issue |
A&A
Volume 402, Number 2, May I 2003
|
|
|---|---|---|
| Page(s) | L13 - L16 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20030370 | |
| Published online | 14 April 2003 | |
Letter to the Editor
Possible contribution of olefins and heteroatoms to the Unidentified Infrared Bands
Service d'Astrophysique and Service de Chimie Moléculaire, CEA Saclay, 91191 Gif-sur-Yvette, France
Corresponding author: papoular@wanadoo.fr
Received:
26
November
2002
Accepted:
12
March
2003
The current assignments of the 11.3-μm feature are dicussed. An unbiased survey of correlation charts suggests that the olefinic group R2C = CH2 is a good alternative candidate. For the 12.7-μm feature, the best fits are provided by nitrites, R-O-N = O, and amines, R-N = H2. Sulfones, SO2, exhibit strong features near 7.7 and 8.6 μm, which may contribute to the UIBs. These additional functional groups are likely to be attached to the main hydrocarbon dust skeleton previously hypothesized.
Key words: ISM: dust, lines and bands, molecules / infrared / astrochemistry
© ESO, 2003
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