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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Yamamoto et al. (1987) studied this question.