Abstract
The rotational spectrum of a short-lived free radical, HCCO, has been observed by using a Fabry-Perot-type Fourier-transform microwave spectrometer combined with a pulsed-discharge nozzle. HCCO has been produced by a discharge of a mixture of C 2H 2 and O 2 diluted in Ar and subsequently cooled to a few Kelvin in a supersonic expansion. All the fine and hyperfine components have been observed for the N = 1-0 rotational transition at 21 GHz. The lines have been analyzed with previously reported data in the submillimeter wave region, leading to a set of the effective constants for the K a = 0 state. The precisely determined magnetic hyperfine constants for the hydrogen nucleus have been discussed in connection with the electronic and geometrical structures of the radical. Transition frequencies for the hyperfine components of several low- N lines have been tabulated with calculated line strengths, as an aid for future astronomical searches of the radical.
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