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| molecules:ism:dicyanide [2024/09/03 16:11] – mueller | molecules:ism:dicyanide [2024/09/03 16:13] (current) – mueller |
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| //Astron. Astrophys.// **688**, Art. No. L31 (2024).\\ | //Astron. Astrophys.// **688**, Art. No. L31 (2024).\\ |
| Both molecules were detected in the course of the QUIJOTE line survey of the dark cloud TMC-1 with the Yebes 40 m dish. | 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 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, consisten with a CCH to CN ration in TMC-1 of about 10.\\ | 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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