The Radio Spectrum of the Phenyl Radical

Details The Radio Spectrum of the Phenyl Radical The Radio Spectrum of the Phenyl Radical

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...590l..61m&link_type=abstract

The Astrophysical Journal, Volume 590, Issue 1, pp. L61-L64.

Astronomy and Astrophysics

Astronomy

9

Ism: Molecules, Line: Identification, Molecular Data, Molecular Processes, Radio Lines: Ism

Scientific paper

The phenyl radical, C6H5, 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.

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