Laboratory and Astronomical Discovery of Magnesium Dicarbide, MgC2

@article{Changala2022LaboratoryAA,
  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},
  year={2022},
  volume={940}
}
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… 

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