===== On Butenyne in the ISM =====

J. Cernicharo, M. Agúndez, C. Cabezas, N. Marcelino, B. Tercero, J. R. Pardo, J. D. Gallego, F. Tercero, J. A. López-Pérez, and P. de Vicente\\
reported on\\
**[[https://doi.org/10.1051/0004-6361/202140434|Discovery of CH<sub>2</sub>CHCCH and detection of HCCN, HC<sub>4</sub>N, CH<sub>3</sub>CH<sub>2</sub>CN, and, tentatively, CH<sub>3</sub>CH<sub>2</sub>CCH in TMC-1]]**\\
//Astron. Astrophys.// **647**, Art. No. L2 (2021).\\
Butenyne, aka vinylacetylene, was identified through 6 //a//-type transitions with 3 ≤ //J// ≤ 5 and //K<sub>a</sub>// = 0 and 1 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 between 32.8 and 49.2 GHz. A value of //T//<sub>rot</sub> = 5.0 ± 0.5 K was derived. The column density of butenyne is about a factor of 1.8 higher than that of the isoelectronic vinyl cyanide.\\



----

Contributor(s): H. S. P. Müller; 05, 2021

----