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

Details 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 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

2004-05-31

arxiv.org/abs/astro-ph/0405627v1

Astron.Astrophys. 424 (2004) 355-361

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1051/0004-6361:20041017

Absorption oscillator strengths have been determined from high-resolution spectra in the 967-972 \AA region 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.

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