===== On SiC3 Isomers in Space =====

There are three SiC<sub>3</sub> isomers which have been studied in the laboratoy, two bicyclic, rhomboidal singlet isomers and a linear triplet species. The prolate bicyclic molecule, with a CC bond creating the bicyclus, is lowest in energy and was observed in space. The other two are considerably higher in energy.

A. J. Apponi, M. C. McCarthy, C. A. Gottlieb, and P. Thaddeus\\
reported on the\\
**[[https://doi.org/10.1086/311998|Astronomical Detection of Rhomboidal SiC<sub>3</sub>]]**\\
//Astrophys. J.// **516**, L103–L106 (1999).\\
7 emission lines of 9 rotational transitions with //J"// between 6 and 8 were detected in the circumstellar envelope of CW Leo (IRC +10216) with the 12 m NRAO telescope between 80 and 103 GHz.


----

Contributor(s): H. S. P. Müller; 05, 2015

----