Laboratory detection of the C5H radical

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmochemistry, Hydrocarbons, Molecular Spectroscopy, Radicals, Ground State, Molecular Rotation, Spin-Orbit Interactions

Scientific paper

The new linear molecule reported by Cernicharo et al. (see Abstr. 112.011) has been found in the same laboratory discharge in which C3H is observed, establishing conclusively that the molecule is C5H in its 2Π ground state. Six rotational transitions in the 2Π1/2 ladder, and four in the 2Π3/2, each split by lambda-doubling, were observed. The twenty millimeter-wave lines were simultaneously fit by a standard Hamiltonian with five free parameters: the fine-structure constant, the rotational constant, the centrifugal distortion constant, and two lambda-doubling constants.

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