Magnesiacyclopropynylidene, MgC2, is somewhat related to silacyclopropynylidene, SiC2.
P. B. Changala, H. Gupta, J. Cernicharo, J. R. Pardo, M. Agúndez, C. Cabezas, B. Tercero, M. Guélin, and M. C. McCarthy
reported on the
Laboratory and Astronomical Discovery of Magnesium Dicarbide, MgC<sub>2</sub>
Astrophys. J. Lett 940, Art. No. L42 (2022).
Ten a-type lines with 1 ≤ J ≤ 7 and Ka ≤ 4 between 41 and 150 GHz were identified for the main 24Mg isotopolog employing the Yebes 40 m and IRAM 30 m dishes in the couses of molecular line surveys of CW Leonis. These lines have good to reasonable signal-to-noise ratios, and several lines are unblended. One and three lines were identified for the 25Mg and 26Mg minor isotopologs, respectively. The isotopic ratios are compatible with solar values within uncertainties. The derived MgC2 : MgC2H : MgC4H : MgC6H abundance raios are about 1 : 2 : 22 : 20.

Contributor(s): H. S. P. Müller; 12, 2022

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