The pure rotational spectrum of FeC (X3Δi)

M. D. Allen, T. C. Pesch, L. M. Ziurys

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53 Scopus citations


The pure rotational spectrum of the FeC radical (X 3Δi) has been measured in the laboratory for the first time using millimeter/submillimeter direct absorption techniques. FeC was created by the reaction of iron vapor, produced in a high-temperature Broida-type oven, and methane gas under DC discharge conditions. Six rotational transitions each were recorded for the two lower spin-orbit ladders of this molecule in the frequency range 240-484 GHz, as well as six transitions for the Ω = 3 ladder of the iron isotopomer 54FeC. The data were analyzed using a 3Δ Hamiltonian, and rotational and certain spin-orbit parameters were determined. The observation of SiC in the circumstellar shell of IRC +10216 suggests that metal carbides such as FeC may be present as well.

Original languageEnglish (US)
Pages (from-to)L57-L60
JournalAstrophysical Journal
Issue number1 PART II
StatePublished - 1996


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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