Laboratory detection of a new carbon-chain molecule C3S and its astronomical identification

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Abstract

Three strong unidentified lines at 23123, 40465, and 46246 MHz recently detected in TMC-1 by Kaifu et al. were assigned to the J = 4-3, 7-6, and 8-7 rotational transitions of a new linear molecule C₃S by using the laboratory spectroscopic result. The C₃S molecule was generated by the same chemical system used for production of the CCS radical (see 131.531). The spectral lines of C₃32S and C₃34S were measured in the frequency region of 70-300 GHz and were least-squares analyzed to determine the molecular constants.

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