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| molecules:ism:mgc2nh-plus [2023/05/09 13:57] – created mueller | molecules:ism:mgc2nh-plus [2023/09/07 12:17] (current) – mueller |
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| **[[https://doi.org/10.1051/0004-6361/202346467|The Magnesium Paradigm in IRC +10216: Discovery of MgC4H+, MgC3N+, MgC6H+, and MgC5N+]]**\\ | **[[https://doi.org/10.1051/0004-6361/202346467|The Magnesium Paradigm in IRC +10216: Discovery of MgC4H+, MgC3N+, MgC6H+, and MgC5N+]]**\\ |
| //Astron. Astrophys.// **672**, Art. No. L13 (2023).\\ | //Astron. Astrophys.// **672**, Art. No. L13 (2023).\\ |
| The molecule was identified in the course of a molecular line survey with the 40 m Yebes radio telescope between 31.0 and 50.3 GHz through seven transitions of which one was slightly and one heavily blended. The rotational temperature is about 13.5 K. It is less abundant than sodium (iso) cyanide by a factor of about 250 to 750.\\ | The molecules were identified in the course of a molecular line survey with the 40 m Yebes radio telescope between 31.0 and 50.3 GHz. |
| | All identifications relied on quantum chemical calculations in the absense of Laboratory spectroscopic data. |
| | Seven successive, unblended transitions with 11 ≤ //J"// ≤ 17 were identified for MgC<sub>4</sub>H<sup>+</sup>. In addition, nine successive transitions with 25 ≤ //J"// ≤ 33 were identified between 72.4 and 95.6 GHz in data of an IRAM 30 m molecular line survey; two transitions were partly blended. |
| | 16 transitions with 26 ≤ //J"// ≤ 41 were accessed in the case of MgC<sub>6</sub>H<sup>+</sup>. Four transitions were partly blended, one was blended heavily. |
| | Seven successive transitions with 11 ≤ //J"// ≤ 17 were identified for MgC<sub>3</sub>N<sup>+</sup> of which five were partially blended. |
| | 16 transitions with 27 ≤ //J"// ≤ 42 were accessed in the case of MgC<sub>5</sub>N<sup>+</sup>. Nine were partially blended, one heavily, and two lines were too week to be detected securely. |
| | The rotational temperatures are around 20 K; the value of ~10 K for MgC<sub>3</sub>N<sup>+</sup> should probably be viewed with great caution. The abundance ratios are about 48 : 12 : 25 : 11 for MgC<sub>4</sub>H<sup>+</sup>, MgC<sub>3</sub>N<sup>+</sup>. MgC<sub>6</sub>H<sup>+</sup>, and MgC<sub>5</sub>N<sup>+</sup>, respectively. The cations are about a factor of 200 less abundant than their neutral counterparts in the case of MgC<sub>4</sub>H<sup>+</sup> and MgC<sub>6</sub>H<sup>+</sup>, whereas is is about a factor of 100 for MgC<sub>3</sub>N<sup>+</sup> and about a factor of 50 for MgC<sub>5</sub>N<sup>+</sup>. Again, the ratios for MgC<sub>3</sub>N<sup>+</sup> should be viewed with caution.\\ |
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