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

M. A. Anderson, Lucy M Ziurys

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

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
Volume452
Issue number2 PART 2
StatePublished - Oct 20 1995
Externally publishedYes

Fingerprint

free radical
atomic absorption spectroscopy
angular momentum
magnesium
rotational spectra
free radicals
molecules
absorption spectroscopy
direct current
telescopes
vapors
interactions
laboratory
mercury
parameter

Keywords

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

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

The millimeter/submillimeter spectrum and rotational rest frequencies of MgCH3(X̃ 2A1). / Anderson, M. A.; Ziurys, Lucy M.

In: Astrophysical Journal, Vol. 452, No. 2 PART 2, 20.10.1995.

Research output: Contribution to journalArticle

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AB - 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.

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