W. G. D. P. Silva, J. Cernicharo, S. Schlemmer, N. Marcelino, J.-C. Loison, M. Agúndez, D. Gupta, V. Wakelam, S. Thorwirth, C. Cabezas, B. Tercero, J. L. Doménech, R. Fuentetaja, W.-J. Kim, P. de Vicente, and O. Asvany
announced the
Discovery of H2CCCH+ in TMC-1,
Astron. Astrophys. 676, Art. No. L1 (2023)
Three a-type transitions with J = 2 − 1 around 38 GHz and one transition near 95.9 GHz were detected with good signal-to-noise ratio in the course of the QUIJOTE line survey carried out with the Yebes 40 m and IRAM 30 m dishes. Only one transition was marginally blended. The molecular cation is only about a factor of three less abundant than the unprotonated propadienylidene.

Contributor(s): H. S. P. Müller; 07, 2023