molecules:ism:mgc2_4h

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molecules:ism:mgc2_4h [2021/09/03 16:54] muellermolecules:ism:mgc2_4h [2021/09/03 17:14] mueller
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 //Astron. Astrophys.// **630**, Art. No. L2 (2019).\\ //Astron. Astrophys.// **630**, Art. No. L2 (2019).\\
  
-The 40 m Centro Astronómico de Yebes dish and the IRAM 30 m dish were employed to observed 22 rotational transitions of magnesium monodiacetylide, MgC<sub>4</sub>H, between 33 and 111 GHz toward the famous near-by carbon-rich AGB star CW Leonis. The authors label 8 transitions between 71 and 108 GHz as observed with two fine structure components and one with one. The astronomical data were employed to derive spectroscopic parameters in the absence of laboratory data.\\+The 40 m Centro Astronómico de Yebes dish and the IRAM 30 m dish were employed to observe 22 rotational transitions of magnesium monodiacetylide, MgC<sub>4</sub>H, between 33 and 111 GHz toward the famous near-by carbon-rich AGB star CW Leonis. The authors label 8 transitions between 71 and 108 GHz as observed with two fine structure components and one with one. The astronomical data were employed to derive spectroscopic parameters in the absence of laboratory data.\\
  
 The authors also present a confirmation of the detection of magnesium monoacetylide, MgC<sub>2</sub>H.  The authors also present a confirmation of the detection of magnesium monoacetylide, MgC<sub>2</sub>H. 
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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 16 rotational transitions of magnesium monotriacetylide, MgC<sub>6</sub>H, with //N"// = 26 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. 10 transitions appear to be unblended or only slightly blended, one FS component each was sufficiently clear for two more transitions. 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 the triacetylide and the diacetylide have about the same column densities, and both are about a factor of 10 more abundant than MgC<sub>2</sub>H. The authors justified this by their likely formation which involves radiative association reactions of Mg<sup>+</sup> with C<sub>2n</sub>H<sub>2</sub>.\\
  
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  • molecules/ism/mgc2_4h.txt
  • Last modified: 2021/09/03 17:29
  • by mueller