@article{1538-4357-516-2-L103,
  author={A. J. Apponi and M. C. McCarthy and C. A. Gottlieb and P. Thaddeus},
  title={Astronomical Detection of Rhomboidal SiC3},
  journal={The Astrophysical Journal Letters},
  volume={516},
  number={2},
  pages={L103},
  url={http://stacks.iop.org/1538-4357/516/i=2/a=L103},
  year={1999},
  abstract={Seven rotational transitions of SiC 3 , a planar, highly polar ring molecule, have been detected in the millimeter-wave band in the expanding envelope of the evolved carbon star IRC +10216. On the assumption that SiC 3 has the same 40'' diameter shell as SiCC, the mean column density of SiC 3 is 4.3×10 12 cm −2 . The rotational excitation of SiC 3 is similar to that of SiCC, with a low rotational temperature within the K -stacks of 10-20 K and a high rotational temperature across the K -stacks of roughly 50 K, which is probably close to the kinetic temperature of the shell.}
}