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Five hyperfine components of the N = 1 - 0 rotational transition of C4H have been detected toward the dust cloud TMC-1. Using these and previously published data, rotation, spin-rotation, and hyperfine constants have been determined for the molecule. An upper limit is presented for the intensity of the strongest component in IRC + 10 deg 216.
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Bell et al. (1982) studied this question.
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