@article{0067-0049-134-2-311,
  author={V. D. Gordon and M. C. McCarthy and A. J. Apponi and P. Thaddeus},
  title={Rotational Spectra of Sulfur-Carbon Chains. I. The Radicals C4S, C5S, C6S, C7S, C8S, and C9S},
  journal={The Astrophysical Journal Supplement Series},
  volume={134},
  number={2},
  pages={311},
  url={http://stacks.iop.org/0067-0049/134/i=2/a=311},
  year={2001},
  abstract={The linear carbon-chain radicals C 6 S, C 7 S, C 8 S, and C 9 S have been detected in a supersonic molecular beam by Fourier transform microwave spectroscopy, and measurements of the previously studied chains C 4 S and C 5 S have been extended using the same technique. The electronic ground state, as predicted, is found to be a triplet for those with an even number of carbon atoms and a singlet for those with an odd number. The microwave spectra of all six chains have been fully characterized, and spectroscopic constants, including fine-structure constants where applicable, have been determined to high precision. Transitions from the J = N and J = N - 1 fine-structure levels of C 4 S have been detected for the first time, and the lengths of the individual bonds of C 5 S have been determined from its isotopic species. The carbon-sulfur chains here are all highly polar, calculated to possess dipole moments in the 4-7 D range; all are plausible candidates for astronomical detection. The spectroscopic constants determined from this work allow transitions up to 40 GHz to be calculated with an uncertainty of less than 1 km s -1 for each chain.}
}