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The linear carbon chain radical C 9 H in its 2 Π 1/2 electronic ground state has been detected in a Fourier transform microwave spectrometer with a supersonic pulsed-jet discharge nozzle. The frequencies of 44 rotational transitions between 5.4 and 16.1 GHz have been measured to a few parts in 10 7 , from which precise values for the rotational, centrifugal distortion, lambda doubling, and hyperfine constants have been determined. These allow calculation of the entire radio spectrum of the ground state of C 9 H to a fraction of 1 km s -1 in equivalent radial velocity.
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McCarthy et al. (1996) studied this question.
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