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

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 C<SUB>3</SUB>S by using the laboratory spectroscopic result. The C<SUB>3</SUB>S molecule was generated by the same chemical system used for production of the CCS radical (see 131.531). The spectral lines of C<SUB>3</SUB><SUP>32</SUP>S and C<SUB>3</SUB><SUP>34</SUP>S were measured in the frequency region of 70-300 GHz and were least-squares analyzed to determine the molecular constants.