@article{1538-4357-590-1-L61,
  author={R. J. McMahon and M. C. McCarthy and C. A. Gottlieb and J. B. Dudek and J. F. Stanton and P. Thaddeus},
  title={The Radio Spectrum of the Phenyl Radical},
  journal={The Astrophysical Journal Letters},
  volume={590},
  number={1},
  pages={L61},
  url={http://stacks.iop.org/1538-4357/590/i=1/a=L61},
  year={2003},
  abstract={The phenyl radical, C 6 H 5 , derived from benzene by removal of one hydrogen atom, was detected at centimeter wavelengths in a pulsed supersonic molecular beam and subsequently at millimeter wavelengths in a low-pressure direct current glow discharge. Fourteen rotational transitions between 9 and 40 GHz and over 50 transitions between 150 and 330 GHz, each split by spin doubling, have been measured for the normal isotopic species, and a comparable number have been measured for the fully deuterated species. The spectrum of both isotopic species at millimeter wavelengths is reproduced to an uncertainty of 0.5 km s -1 or better with seven spectroscopic constants. Rotational constants predicted from high-level molecular structure calculations are in excellent agreement with the measurements. Phenyl is a prime candidate for astronomical detection, because it is the prototypical aromatic hydrocarbon radical and a possible progenitor of other aromatic species.}
}