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Laboratory detection and millimeter spectrum of the MgCCH radical
Anderson, M. A.; Ziurys, L. M.
AA(Arizona State University, Tempe, AZ), AB(Arizona State University, Tempe, AZ)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 439, no. 1, p. L25-L28 (ApJL Homepage)
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NASA/STI Keywords:
Acetyl Compounds, Fine Structure, Magnesium Compounds, Radicals, Rotational Spectra, Rotational States, Absorption Spectroscopy, Interstellar Matter, Millimeter Waves, Submillimeter Waves
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The pure rotational spectrum of the magnesium monoacetylide radical, MgCCH, has been recorded in the laboratory using millimeter/sub-mm direct absorption spectroscopy. These measurements constitute the first time this molecule has been observed in the laboratory by any spectroscopic method. Seventeen rotational transitions were observed in the frequency range 210-370 GHz for MgCCH, which appears to be a linear molecule with a 2Sigma ground electronic state. Rotational and fine structure constants were determined for this radical from a nonlinear least squares fit to the data. The rotational rest frequencies measured here will enable astronomical observations to be carried out for MgCCH towards IRC +10216, where the magnesium compounds MgCN and MgNC, as well as many acetylide species, are present.

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