Oscillator strengths for b-x, c-x, and e-x transitions in carbon monoxide

S. R. Federman, M. Fritts, S. Cheng, K. M. Menningen, David C. Knauth, K. Fulk

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Band oscillator strengths for electronic transitions in CO were obtained at the Synchrotron Radiation Center of the University of Wisconsin-Madison. Our focus was on transitions observed in interstellar spectra with the Far-Ultraviolet Spectroscopic Explorer; these transitions are also important in studies of selective isotope photodissociation, where fractionation among isotopomers can occur. Absorption from the ground state X 1Σ+ (v″ = 0) to A 1Π (v′ = 5), B 1Σ+ (v′ = 0, 1), C 1Σ+ (v′ = 0, 1), and E 1Π (v′ = 0) was measured. Fits to the A-X (5, 0) band, whose oscillator strength is well known, yielded the necessary column density and excitation temperature. These parameters were used in a least-squares fit of the observed profiles to extract the band oscillator strengths of the transitions of interest. Our oscillator strengths are in excellent agreement with results from recent experiments using a variety of techniques. This agreement provides the basis for a self-consistent set of f-values at far-ultraviolet wavelengths for studies of interstellar (and stellar) CO.

Original languageEnglish (US)
Pages (from-to)133-138
Number of pages6
JournalAstrophysical Journal, Supplement Series
Volume134
Issue number1
DOIs
StatePublished - May 2001

Keywords

  • ISM: Molecules
  • Methods: Laboratory
  • Molecular data
  • Ultraviolet: ISM

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