High-resolution study of oscillator strengths and predissociation rates for 13C16O and 12C18O

W - X bands and Rydberg complexes in the 92.5-97.5 nm range

M. Eidelsberg, J. L. Lemaire, S. R. Federman, G. Stark, A. N. Heays, L. Gavilan, James Lyons, P. L. Smith, N. De Oliveira, D. Joyeux

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Models of astronomical environments containing CO require accurate molecular data to reproduce and interpret observations. We conduct experiments at the SOLEIL synchrotron facility to acquire data to model CO photochemistry in the vacuum ultraviolet. The improvement in UV spectroscopic instrumentation in both sensitivity and resolution provides more accurate laboratory spectroscopic determinations. We continue our work on photoabsorption oscillator strengths and predissociation rates for 12C16O; we report new measurements for two additional isotopologues, 13C16O and 12C18O, of four bands from X 1Σ + (v′′ = 0) to the v′ = 0-3 vibrational levels of the core-excited W 1Π Rydberg state and for four overlapping bands (three resolved and one diffuse) between 92.97 and 93.35 nm. Some of the latter include unidentified perturbations. Absorption spectra were recorded using the vacuum-ultraviolet Fourier-transform spectrometer that is installed on the DESIRS beamline at SOLEIL which provides a resolving power R = 350 000. This resolution allows the analysis of individual line strengths and widths in the electronic transitions and the identification of a previously unobserved perturbation in the W(1) level. Gas column densities in the differentially- pumped system were calibrated using the B 1Σ+ - X 1Σ+ (v′ = 0,v′′ = 0) band. Absorption bands are analyzed by synthesizing line and band profiles and fitting them to the measured spectra. These considerably improved results are compared with earlier determinations.

Original languageEnglish (US)
Article numberA96
JournalAstronomy and Astrophysics
Volume566
DOIs
StatePublished - Jan 1 2014

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superhigh frequencies
oscillator strengths
perturbation
high resolution
photochemistry
absorption spectrum
Fourier transform
instrumentation
spectrometer
absorption spectra
vacuum
photoabsorption
gas
photochemical reactions
synchrotrons
experiment
spectrometers
rate
sensitivity
profiles

Keywords

  • ISM: molecules
  • Methods: laboratory: molecular
  • Techniques: spectroscopic
  • Ultraviolet: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

High-resolution study of oscillator strengths and predissociation rates for 13C16O and 12C18O : W - X bands and Rydberg complexes in the 92.5-97.5 nm range. / Eidelsberg, M.; Lemaire, J. L.; Federman, S. R.; Stark, G.; Heays, A. N.; Gavilan, L.; Lyons, James; Smith, P. L.; De Oliveira, N.; Joyeux, D.

In: Astronomy and Astrophysics, Vol. 566, A96, 01.01.2014.

Research output: Contribution to journalArticle

Eidelsberg, M. ; Lemaire, J. L. ; Federman, S. R. ; Stark, G. ; Heays, A. N. ; Gavilan, L. ; Lyons, James ; Smith, P. L. ; De Oliveira, N. ; Joyeux, D. / High-resolution study of oscillator strengths and predissociation rates for 13C16O and 12C18O : W - X bands and Rydberg complexes in the 92.5-97.5 nm range. In: Astronomy and Astrophysics. 2014 ; Vol. 566.
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AU - Lemaire, J. L.

AU - Federman, S. R.

AU - Stark, G.

AU - Heays, A. N.

AU - Gavilan, L.

AU - Lyons, James

AU - Smith, P. L.

AU - De Oliveira, N.

AU - Joyeux, D.

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