J. Cernicharo, C. Cabezas, M. Agúndez, R. Fuentetaja, B. Tercero, N. Marcelino, and P. de Vicente
announced
More sulphur in TMC-1: Discovery of the NC₃S and HC₃S radicals with the QUIJOTE line survey
Astron. Astrophys. 688, Art. No. L13 (2024).
Propadienethionyl, HC₃S, was detected through three consecutive transitions with 13/2 ≤ J' ≤ 17/2 between 34.8 and 45.6 GHz in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. The lines displayed well-resolved Λ-doubling and (reasonably) resolved ¹H hyperfine structure splitting. Some HFS compoents are (essentially) unblended, several slightly or severely. The authors state abundance ratios HCS/HCCS of ~8.1, HCCS/HC₃S of ~4.5, and HC₃S/HC₄S of ~1.6. HC₅S was evaluated to be near the present sensitivity limit of the survey.

Contributor(s): H. S. P. Müller; 08, 2024