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--- molecules:ism:mnc_mcn [2019/10/21 17:33] – mueller
+++ molecules:ism:mnc_mcn [2019/10/23 22:18] (current) – mueller
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 ===== Detections of Metal Isocyanides and Metal Cyanides in Circumstellar Envelopes =====
-**Magnesium isocyanide**, **MgNC**, is a linear radical which is lower in energy than its MgCN isomer. It was observed first as an unidentified species in the circumstellar envelope of the famous carbon star CW Leo, also known as IRC +10216, by\\
+==== MgNC ====
+**Magnesium isocyanide** is a linear radical which is lower in energy than its MgCN isomer. It was observed first as an unidentified species in the circumstellar envelope of the famous carbon star CW Leo, also known as IRC +10216, by\\
 M. Guélin, J. Cernicharo, C. Kahane, E. González-Alfonso,\\
 **[[https://ui.adsabs.harvard.edu/abs/1986A%26A...157L..17G|A New Free Radical in IRC +10216]]**\\
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-**Sodium cyanide**, **NaCN**, is a nearly T-shaped molecule. It possesses a NaN bond that is slightly shorther than the NaC bond. Therefore, the molecule should be considered more appropriately as sodium **iso**cyanide, NaNC. It was observed first in the circumstellar envelope of CW Leo in four //K<sub>a</sub>// = 0 transitions by\\
+==== NaCN ====
+**Sodium cyanide** is a nearly T-shaped molecule. It possesses a NaN bond that is slightly shorther than the NaC bond. Therefore, the molecule should be considered more appropriately as sodium **iso**cyanide, NaNC. It was observed first in the circumstellar envelope of CW Leo in four //K<sub>a</sub>// = 0 transitions by\\
 B. E. Turner, T. C. Steimle, and L. Meerts,\\
 **[[https://ui.adsabs.harvard.edu/abs/1994ApJ...426L..97T|Detection of Sodium Cyanide (NaCN) in IRC+10216]]**\\
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-The **magnesium cyanide** isomer, **MgCN**, was detected in three transitions with //N"// = 8, 9, and 10, all lying in the 3 mm region, by:\\
+==== MgCN ====
+The **magnesium cyanide** isomer was detected in three transitions with //N"// = 8, 9, and 10, all lying in the 3 mm region, by:\\
 L. M. Ziurys, A. J. Apponi, M. Guélin, and J. Cernicharo,\\
 **[[https://ui.adsabs.harvard.edu/abs/1995ApJ...445L..47Z|Detection of MgCN in IRC +10216: A New Metal-bearing Free Radical]]**\\
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-**Aluminum isocyanide**, **AlNC**, is a linear molecule which is lower in energy than its AlCN isomer. It was observed in five transitions (//J"// = 10, 11, and 12 in the 2 mm region and //J"// = 17 and 20 in the 1 mm region) toward CW Leo by:\\
+==== AlNC ====
+**Aluminum isocyanide** is a linear molecule which is lower in energy than its AlCN isomer. It was observed in five transitions (//J"// = 10, 11, and 12 in the 2 mm region and //J"// = 17 and 20 in the 1 mm region) toward CW Leo by:\\
 L. M. Ziurys, C. Savage, J. L. Highberger, A. J. Apponi, M. Guélin, and J. Cernicharo,\\
 **[[https://doi.org/10.1086/338775|More Metal Cyanide Species: Detection of AlNC (X <sup>1</sup>Σ<sup>+</sup>) toward IRC +10216]]**\\
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-**Potassium cyanide**, **KCN**, is a nearly T-shaped molecule, just as NaCN. It too should be considered as an isocyanide rather than a cyanide. Several transitions in the 3, 2, and 1 mm region were detected toward CW Leo by:\\
+==== KCN ====
+**Potassium cyanide** is a nearly T-shaped molecule, just as NaCN. It too should be considered as an isocyanide rather than a cyanide. Several transitions in the 3, 2, and 1 mm region were detected toward CW Leo by:\\
 R. L. Pulliam, C. Savage, M. Agúndez, J. Cernicharo, M. Guélin, and L. M. Ziurys,\\
 **[[https://doi.org/10.1088/2041-8205/725/2/L181|Identification of KCN in IRC +10216: Evidence for Selective Cyanide Chemistry]]**\\
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-**Iron cyanide**, **FeCN**, is a linear molecule. According to laboratory spectroscopic work, it actually is lowein in energy than iron isocyanide, FeNC. The molecule has a <sup>4</sup>Δ<sub>i</sub> ground state with considerable spin-orbit splitting. The Ω = 7/2 spin component is lowest in energy. Three apparently clean transitions with //J"// = 9.5, 11.5, and 12.5 as well as two partially overlapped transitions (10.5 and 15.5) were detected with the ARO 12 m radio-telescope toward CW Leo by:\\
+==== FeCN ====
+**Iron cyanide** is a linear molecule. According to laboratory spectroscopic work, it actually is lowein in energy than iron isocyanide, FeNC. The molecule has a <sup>4</sup>Δ<sub>i</sub> ground state with considerable spin-orbit splitting. The Ω = 7/2 spin component is lowest in energy. Three apparently clean transitions with //J"// = 9.5, 11.5, and 12.5 as well as two partially overlapped transitions (10.5 and 15.5) were detected with the ARO 12 m radio-telescope toward CW Leo by:\\
 L. N. Zack, D. T. Halfen, and L. M. Ziurys,\\
 **[[https://doi.org/10.1088/2041-8205/733/2/L36|Detection of FeCN (//X// <sup>4</sup>Δ<sub>i</sub>) in IRC +10216: A New Interstellar Molecule]]**\\