Rotational rest frequencies for CrO (X 5Πr) and CrN (X 4-)

P. M. Sheridan, M. A. Brewster, L. M. Ziurys

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The pure rotational spectra of CrO (X 5Πr) and CrN (X 4-) have been recorded using millimeter/sub-millimeter-wave spectroscopy in the frequency range 248-636 GHz. These radicals were created by the reaction of chromium vapor, produced in a Broida-type oven, with N2O or NH3 under DC discharge conditions. For CrO, 12 rotational transitions were recorded, in which up to five spin-orbit components were observed - the first measurement of the pure rotational spectrum of a molecule in a 5Π electronic state. Nine rotational transitions were recorded for CrN; here all four spin components were measured in every transition. The data obtained for both radicals were analyzed using an appropriate effective Hamiltonian. The resulting spectro-scopic parameters of these species were determined to high precision, including those related to fine structure and lambda doubling. This work will enable radioastronomical searches for CrN and CrO to be carried out. CrO has already been observed in the optical spectra of stellar atmospheres.

Original languageEnglish (US)
Pages (from-to)1108-1114
Number of pages7
JournalAstrophysical Journal
Issue number2 I
StatePublished - Sep 10 2002


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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