Oscillator strengths for transitions to Rydberg levels in ${}^{12}{C}^{16}O$, ${}^{13}{C}^{16}O$ and ${}^{13}{C}^{18}O$ between 967 and 972 A

Abstract

Absorption oscillator strengths have been determined from high-resolution spectra in the 967-972 Åregion of three CO isotopomers for transitions to the Rydberg levels 4{\it p$\pi$}(0), 3{\it d$\pi$}(1) and 4{\it p$\sigma$}(0), as well as to the mixed {\it E(6)} level recently characterized by Eidelsberg et al. (2004). Synchrotron radiation from the Super-ACO electron storage ring at Orsay (LURE) was used as a light source. Oscillator strengths were extracted from the recorded spectra by least-squares fitting of the experimental profiles with synthetic spectra taking into account the homogeneous and heterogeneous interactions of the four levels. Column densities were derived from fits to the 3{\it p$\pi$}(0) absorption band whose oscillator strength is well established. These are the first reported measurements for ${}^{13}$C${}^{18}$O. For ${}^{12}$C${}^{16}$O, our results are consistent with the larger values obtained in the most recent laboratory and astronomical studies.

arXiv comment9 pages 7 figures 3 tables. Accepted in A&A, date of acceptance 11/05/2004

References in corpus (4)

• Further Evidence for Chemical Fractionation from Ultraviolet Observations of Carbon Monoxide
• Oscillator Strengths for B-X, C-X, and E-X Transitions in Carbon Monoxide
• Ultraviolet Detection of Interstellar 12C17O and the CO Isotopomeric Ratios toward X Persei
• FUSE Measurements of Rydberg Bands of Interstellar CO between 925 and 1150 A

Cited by in corpus (4)

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• Ultraviolet Survey of CO and H_2 in Diffuse Molecular Clouds: The Reflection of Two Photochemistry Regimes in Abundance Relationships
• Hubble Space Telescope Survey of Interstellar ^12CO/^13CO in the Solar Neighborhood
• Oscillator Strengths and Predissociation Rates for Rydberg Transitions in 12C16O, 13C16O, and 13C18O Involving the E 1Pi, B 1Sigma+, and W 1Pi States