===== On Butyne in the ISM =====

 J. Cernicharo, B. Tercero, M. Agúndez, C. Cabezas, R. Fuentetaja, N. Marcelino and P. de Vicente\\
reported on\\
**[[https://doi.org/10.1051/0004-6361/202449531|CN and CCH Derivatives of Ethylene and Ethane: Confirmation of the Detection of CH<sub>3</sub>CH<sub>2</sub>CCH in TMC-1]]**\\
//Astron. Astrophys.// **686**, Art. No. A139 (2024).\\
1-Butyne, aka ethylacetylene, was identified through 9 unblended or slightly blended //a//-type transitions with 3 ≤ //J// ≤ 5 and //K<sub>a</sub>// ≤ 2 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 33.6 and 44.3 GHz. A value of //T//<sub>rot</sub> ≈ 9 K was derived. The column density of 1-butnyne is about a factor of 15 lower than that of butenyne.\\

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Contributor(s): H. S. P. Müller; 06, 2024

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