Laboratory and Astronomical Discovery of Magnesium Dicarbide, MgC2

  title={Laboratory and Astronomical Discovery of Magnesium Dicarbide, MgC2},
  author={P. Bryan Changala and H. Gupta and Jos{\'e} Cernicharo and Juan R. Pardo and Marcelino Ag'undez and Carlos Cabezas and Bel{\'e}n Tercero and M. Gu{\'e}lin and Mary C. McCarthy},
  journal={The Astrophysical Journal Letters},
We report the detection of magnesium dicarbide, MgC2, in the laboratory at centimeter wavelengths and assign 24MgC2, 25MgC2, and 26MgC2 to 14 unidentified lines in the radio spectrum of the circumstellar envelope of the evolved carbon star IRC+10216. The structure of MgC2 is found to be T-shaped with a highly ionic bond between the metal atom and the C2 unit, analogous to other dicarbides containing electropositive elements. A two-temperature excitation model of the MgC2 emission lines observed… 



Discovery of two new magnesium-bearing species in IRC+10216: MgC3N and MgC4H.

The synthesis of these magnesium cyanides and acetylides in IRC +10216 can be explained in terms of a two-step process initiated by the radiative association of Mg+ with large cyanopolyynes and polyynes followed by the dissociative recombination of the ionic complexes.

Magnesium radicals MgC5N and MgC6H in IRC +10216

After the previous discovery of MgC3N and MgC4H in IRC +10216, a deeper Q-band (31.0–50.3 GHz) integration on this source had revealed two additional series of harmonically related doublets that we

Laboratory Spectroscopy of MgNC: The First Radioastronomical Identification of Mg-bearing Molecule

The linear MgNC radical was detected, for the first time, by laboratory microwave spectroscopy, and six unidentified lines in IRC +10216 reported by Guelin et al. (1986) were assigned to the

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Various pathways to the metal cyanides Na(CN), Mg(CN) and Al(CN) - some of which have been detected in the circumstellar envelope IRC + 10216 - are critically assessed. Calculations of rate

Ab initio characterization of MgCCH, MgCCH+, and MgC2 and pathways to their formation in the interstellar medium.

  • D. Woon
  • Physics, Chemistry
    The Astrophysical journal
  • 1996
A study of Mg-bearing compounds has been performed in order to determine molecular properties which are critical for planning new astronomical searches and laboratory studies, and a number of ion-molecule or neutral-neutral exchange reactions between CCH and various M g-containing species offer plausible pathways to MgCCH or Mg CCH+.

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We report calculated rate coefficients for the radiative association reactions of M+ (Na+, Mg+, or Al+) with cyanopolyynes HC2n+1N (n = 0-4) and polyynes HC2nH (n = 1-5), at temperatures relevant to

Peculiar Structures of Small Magnesium Carbide Clusters: MgC2, (MgC2)2, and (MgC2)4

The geometries of MgC2, (MgC2)2, and (MgC2)4 in their ground and low-lying excited electronic states have been determined via ab initio electronic structure methods with flexible basis sets and using

Gas phase atomic metals in the circumstellar envelope of IRC+10216

We report the results of a search for gas phase atomic metals in the circumstellar envelope of the asymptotic giant branch carbon star IRC+10216. The search was made using high resolution (λ/∆λ = 50

Infrared spectroscopy of carbo‐ions. IV. The A 2Πu–X 2Σ+g electronic transition of C−2

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