molecules:ism:hc2chs [CDMS classic documentation]

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===== On Thiopropynal in the ISM =====

J. Cernicharo, C. Cabezas, Y. Endo, M. Agúndez, B. Tercero, J. R. Pardo, N. Marcelino, and P. de Vicente\\
report on\\
**[[https://doi.org/10.1051/0004-6361/202141297|The Sulphur Saga in TMC-1: Discovery of HCSCN and HCSCCH]]**\\
//Astron. Astrophys.// **650**, Art. No. L14 (2021).\\
HC<sub>2</sub>CHS was identified through 6 //a//-type transitions, of which 5 appear to be unblended, with 5 ≤ //J// ≤ 8 and //K<sub>a</sub>// ≤ 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 30.1 and 50.4 GHz. A value of //T//<sub>rot</sub> = 5.0 K was assumed, in keeping with cyanothioformaldehyde. The column density of HC<sub>2</sub>CHS is about a factor of 5 lower than that of the isovalent HC<sub>2</sub>CHO, similar to the corresponding factor of 10 between thioformaldehyde and formaldehyde. In addition, the column density of HC<sub>2</sub>CHS is about a factor of 4 lower than that of the isoelectronic HC(S)CN; the latter molecule is unusually abundant in TMC-1.\\


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Contributor(s): H. S. P. Müller; 06, 2021

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