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| molecules:ism:hcscn [2021/06/30 16:56] – mueller | molecules:ism:hcscn [2021/06/30 17:10] (current) – mueller |
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| **[[https://doi.org/10.1051/0004-6361/202141297|The Sulphur Saga in TMC-1: Discovery of HCSCN and HCSCCH]]**\\ | **[[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).\\ | //Astron. Astrophys.// **650**, Art. No. L14 (2021).\\ |
| Cyanothioformaldehyde, aka thioformyl cyanide, was identified through 10 unblended or only slightly blended //a//-type transitions with 4 ≤ //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.\\ | Cyanothioformaldehyde, aka thioformyl cyanide, was identified through 10 unblended or only slightly blended //a//-type transitions with 4 ≤ //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. Also observed were 9 much weaker //b//-type transitions with 1 ≤ //J// ≤ 9 and //K<sub>a</sub>// ≤ 1; some of these were blended, and several were affected by low signal-to-noise ratios. A value of //T//<sub>rot</sub> = 5.0 ± 0.5 K was derived. The column density of HC(S)CN is unusually high compared to related molecules. It is about a factor of 4 **higher** than that of the isovalent HC(O)CN, whereas the one of HC<sub>2</sub>CHS is about a factor of 5 **lower** than that of HC<sub>2</sub>CHO, similar to the corresponding factor of 10 between thioformaldehyde and formaldehyde.\\ |
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