C. Cabezas, M. Agúndez, N. Marcelino, B. Tercero, Y. Endo, R. Fuentetaja, J. R. Pardo, P. de Vicente, and J. Cernicharo
reported on the
Discovery of the Elusive Thioketenylium, HCCS⁺, in TMC-1
Astron. Astrophys. 654, Art. No. A45 (2021).
Thioketenylium, HCCS⁺, was observed in the course of molecular line surveys of TMC-1 carried out at 7 and 3 mm using the Yebes 40 m and IRAM 30 m telescopes, respectively. Rotational transitions with N = 2 − 1 to 4 − 3 and 6 − 5 to 8 − 7 were identified between 32.1 and 99.7 GHz with resolved fine and ¹H hyperfine splitting (not all fine structure components were covered). The CCS/HCCS⁺ column density ratio of 50 ± 10 is similar to those of CS/HCS⁺ (35 ± 8) and CCCS/HCCCS⁺ (65 ± 20).

Contributor(s): H. S. P. Müller; 03, 2022