The millimeter/submillimeter spectrum and rotational rest frequencies of MgCH3(X̃ 2A1)

M. A. Anderson, Lucy M Ziurys

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The pure rotational spectrum of the free radical MgCH3(X̃ 2A1) has been measured in the laboratory for the first time using millimeter/submillimeter direct absorption spectroscopy. The molecule was made in a DC discharge by the reaction of magnesium vapor and dimethyl mercury. Ten rotational transitions of this species were observed in the range 176-374 GHz. MgCH3 is a symmetric top molecule with net spin angular momentum. Consequently, both K structure and spin-rotation interactions were observed in every rotational transition. The data were analyzed with a 2A1 Hamiltonian and rotational, centrifugal distortion, and tine-structure parameters were accurately determined. These measurements will now enable a search for this radical in interstellar and 1 circumstellar sources to be conducted using millimeter/submillimeter telescopes.

Original languageEnglish (US)
JournalAstrophysical Journal
Issue number2 PART 2
Publication statusPublished - Oct 20 1995
Externally publishedYes



  • ISM: molecules
  • Line: identification
  • Methods: laboratory
  • Molecular data

ASJC Scopus subject areas

  • Space and Planetary Science

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