@article{1538-4357-536-1-L55,
  author={A. J. Apponi and M. C. McCarthy and C. A. Gottlieb and P. Thaddeus},
  title={The Radio Spectra of SiCCH, SiCN, and SiNC},
  journal={The Astrophysical Journal Letters},
  volume={536},
  number={1},
  pages={L55},
  url={http://stacks.iop.org/1538-4357/536/i=1/a=L55},
  year={2000},
  abstract={Three new silicon-bearing radicals of astrophysical interest, SiCCH and the two nearly isoenergetic isomers SiCN and SiNC, were detected in a laboratory discharge in their X 2 Π ground states by Fourier transform microwave and millimeter-wave absorption spectroscopy. Hyperfine structure was observed in the low rotational transitions of the 2 Π 1/2 ladder, and well-resolved Λ-doubling was observed in both fine-structure ladders. With the spectroscopic constants derived from the laboratory measurements, the spectra of all three can be calculated to an uncertainty of less than 0.1 km s -1 in equivalent radial velocity over the entire range of interest to radio astronomers. SiCN, with a dipole moment of 2.9 D, is probably the most promising of the three for astronomical discovery.}
}