===== On the Detection of Propadienylium, H2C3H+, in Space =====

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\\
**[[https://doi.org/10.1051/0004-6361/202347174|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.\\
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Contributor(s): H. S. P. Müller; 07, 2023

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