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| molecules:ism:mgc3n [2021/09/03 17:25] – mueller | molecules:ism:mgc3n [2021/09/03 17:30] (current) – mueller |
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| **[[https://doi.org/10.1051/0004-6361/202141671|Magnesium Radicals MgC<sub>5</sub>N and MgC<sub>6</sub>H in IRC +10216]]**\\ | **[[https://doi.org/10.1051/0004-6361/202141671|Magnesium Radicals MgC<sub>5</sub>N and MgC<sub>6</sub>H in IRC +10216]]**\\ |
| //Astron. Astrophys.// **652**, Art. No. L13 (2021).\\ | //Astron. Astrophys.// **652**, Art. No. L13 (2021).\\ |
| The 40 m Centro Astronómico de Yebes dish was employed to observe 15 rotational transitions of magnesium cyanodiacetylide, MgC<sub>5</sub>N, with //N"// = 27 to 41 between 31.0 and 50.3 GHz toward the famous near-by carbon-rich AGB star CW Leonis. Some of the transitions displayed resolved fine structure (FS) splitting. 14 transitions appear to be unblended or only slightly blended. The identification of a new species is unambiguous. The identification of the carrier may be viewed with slight caution in the absence of laboratory data. However, the FS spltting is a very strong indicator that the identification is unambiguous as well. It is very interesting to note that MgC<sub>5</sub>N has a column density only a factor of two lower than that of MgC<sub>3</sub>N, but about a factor of six higher than that of MgCN. The authors justified this by their likely formation which involves radiative association reactions of Mg<sup>+</sup> with HC<sub>2n+1</sub>N. These ratios are similar to thos of the isoelectronic MgC<sub>6</sub>H. MgNC is about a factor of three more abundant than MgC<sub>5</sub>N.\\ | The 40 m Centro Astronómico de Yebes dish was employed to observe 15 rotational transitions of magnesium cyanodiacetylide, MgC<sub>5</sub>N, with //N"// = 27 to 41 between 31.0 and 50.3 GHz toward the famous near-by carbon-rich AGB star CW Leonis. Some of the transitions displayed resolved fine structure (FS) splitting. 14 transitions appear to be unblended or only slightly blended. The identification of a new species is unambiguous. The identification of the carrier may be viewed with slight caution in the absence of laboratory data. However, the FS spltting is a very strong indicator that the identification is unambiguous as well. It is very interesting to note that MgC<sub>5</sub>N has a column density only a factor of two lower than that of MgC<sub>3</sub>N, but about a factor of six higher than that of MgCN. The authors justified this by their likely formation which involves radiative association reactions of Mg<sup>+</sup> with HC<sub>2n+1</sub>N. These ratios are similar to those of the isoelectronic MgC<sub>2n</sub>H molecules. MgNC is about a factor of three more abundant than MgC<sub>5</sub>N.\\ |
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