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The ethynyl radical C2H - A new interstellar molecule
Tucker, K. D.; Kutner, M. L.; Thaddeus, P.
AA(NASA, Goddard Institute for Space Studies, New York, N.Y.), AB(Columbia University, New York, N.Y.), AC(NASA, Goddard Institute for Space Studies; Columbia University, New York, N.Y.)
Astrophysical Journal, vol. 193, Nov. 1, 1974, pt. 2, p. L115-L119. NASA-supported research. (ApJL Homepage)
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NASA/STI Keywords:
Free Radicals, Hydrocarbons, Interstellar Gas, Line Spectra, Molecular Spectra, Hyperfine Structure, Molecular Energy Levels, Molecular Rotation, Radio Astronomy, Tables (Data)
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Four new interstellar lines have been detected near 87.3 GHz. Based on laboratory ESR data these lines have been positively defined as hyperfine components of the lowest rotational transition of the ethynyl radical C2H. The observations gave precise values for the C2H rotation, spin-doubling, and hyperfine constants. C2H is probably one of the most abundant interstellar polyatomic molecules yet detected.

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