The millimeter-wave spectrum and rest frequencies of FeF (X6Δi)

M. D. Allen, L. M. Ziurys

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The pure rotational spectrum of the FeF radical (X6Δi) has been measured in the laboratory using millimeter/submillimeter direct absorption techniques. FeF was created by the reaction of iron vapor, produced in a high-temperature Broida-type oven, and F2. Eleven rotational transitions in the frequency range 121-374 GHz were recorded in all six spin-orbit components. Lambda-type doubling was resolved in the Ω2 = 3/2, 1/2, and -1/2 sublevels, and hyperfine structure, arising from the fluorine nuclear spin, was observed in all spin-orbit ladders. The data were successfully analyzed using a 6Δ Hamiltonian and rotational, spin-orbit, spin-spin, lambda-doubling, and hyperfine parameters were determined. The observation of A1F in the circumstellar shell of IRC+10216 suggests that other fluoride molecules such as FeF may be present in this object.

Original languageEnglish (US)
Pages (from-to)1237-1242
Number of pages6
JournalAstrophysical Journal
Issue number2 PART I
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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