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| molecules:ism:dicyanide [2024/09/03 15:42] – created mueller | molecules:ism:dicyanide [2024/09/03 16:13] (current) – mueller |
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| ===== On the Detection of Dicyanides in the ISM ===== | ===== On the Detection of Dicyanides in the ISM ===== |
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| R. Fuentetaja, C. Cabezas, Y. Endo, M. Agúndez, B. Tercero, N. Marcelino, P. de Vicente, and J. Cernicharo\\ | M. Agúndez, C. Bermúdez, C. Cabezas, G. Molpeceres, Y. Endo, N. Marcelino, B. Tercero, J.-C. Guillemin, P. de Vicente, and J. Cernicharo\\ |
| described the\\ | discovered\\ |
| **[[https://doi.org/10.1051/0004-6361/202451319|Space and laboratory discovery of iminopentadienylidene, HNC5]]**\\ | **[[https://doi.org/10.1051/0004-6361/202451525|The rich interstellar reservoir of dinitriles: Detection of malononitrile and maleonitrile in TMC-1]]**\\ |
| //Astron. Astrophys.// **688**, Art. No. L29 (2024).\\ | //Astron. Astrophys.// **688**, Art. No. L31 (2024).\\ |
| The molecule was detected in the course of the QUIJOTE line survey of the dark cloud TMC-1 with the Yebes 40 m dish through six rotational transitions between 32.6 and 46.3 GHz having 11 ≤ //J// ≤ 17 with good to reasonable signal-to-noise ratios. A rotational tempertaure of 6.0 ± 0.5K was derived. The column density ratios are about 45 : 1 for HNC<sub>3</sub> : HNC<sub>5</sub> and about 5100 : 10 : 1 for HC<sub>5</sub>N : HC<sub>4</sub>NC : HNC<sub>5</sub>.\\ | Both molecules were detected in the course of the QUIJOTE line survey of the dark cloud TMC-1 with the Yebes 40 m dish. |
| | Dicyanomethane or malononitrile was identified through four rotational transitions with modest S/N and partially resolved <sup>14</sup>N HFS splitting and 4 ≤ //J// ≤ 10 and //K<sub>a</sub>// ≤ 1. Other lines are heavily blended or have a lower S/N. //Z//-1,2-Dicyanoethene or maleonitrile was identified through four rotational transitions with modest S/N of which one displayed partially resolved <sup>14</sup>N HFS splitting; one HFS line of another transition is shown as are some blended lines. The quantum numbers were 7 ≤ //J// ≤ 11 and //K<sub>a</sub>// ≤ 1. The abundance ratio of dicyanomethane to //Z//-1,2-dicyanoethene is about 3.5. Related molecules with one CN replaced by CCH are more abundant by varying degrees, consistent with a CCH to CN ration in TMC-1 of about 10.\\ |
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