molecules:ism:mgc2nh-plus [CDMS classic documentation]

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===== Detection of Magnesium Polyacetylide Cations toward CW Leonis =====

J. Cernicharo, C. Cabezas, J. R. Pardo, M. Agúndez, O. Roncero, B. Tercero, N. Marcelino, M. Guélin, Y. Endo, and P. de Vicente\\
reported on the\\
**[[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).\\
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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Contributor(s): H. S. P. Müller; 05, 2023

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