A&A 402, L13-L16 (2003)
Possible contribution of olefins and heteroatoms to the Unidentified Infrared BandsR. Papoular
Service d'Astrophysique and Service de Chimie Moléculaire, CEA Saclay, 91191 Gif-sur-Yvette, France
(Received 26 November 2002 / Accepted 12 March 2003)
The current assignments of the 11.3- m feature are dicussed. An unbiased survey of correlation charts suggests that the olefinic group R 2C = CH 2 is a good alternative candidate. For the 12.7- m feature, the best fits are provided by nitrites, R-O-N = O, and amines, R-N = H 2. Sulfones, SO 2, exhibit strong features near 7.7 and 8.6 m, 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