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Issue A&A
Volume 424, Number 1, September II 2004
Page(s) 355 - 361
Section Atomic, molecular and nuclear data
DOI http://dx.doi.org/10.1051/0004-6361:20041017



A&A 424, 355-361 (2004)
DOI: 10.1051/0004-6361:20041017

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

M. Eidelsberg1, J. L. Lemaire1, 2, J. H. Fillion1, 2, F. Rostas1, S. R. Federman3 and Y. Sheffer3

1  LERMA, UMR 8112 du CNRS, Observatoire de Paris, 92195 Meudon Cedex, France
    e-mail: michele.eidelsberg@obspm.fr
2  LERMA/LAMAp, UMR 8112 du CNRS, Université de Cergy-Pontoise, 95031 Cergy-Pontoise, France
3  Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606, USA

(Received 3 April 2004 / Accepted 11 May 2004 )

Abstract
Absorption oscillator strengths have been determined from high-resolution spectra in the 967-972 Å region of three CO isotopomers for transitions to the Rydberg levels 4p $\pi$(0), 3d $\pi$(1) and 4p $\sigma$(0), as well as to the mixed 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 3p $\pi$(0) absorption band whose oscillator strength is well established. These are the first reported measurements for 13C 18O. For 12C 16O, our results are consistent with the larger values obtained in the most recent laboratory and astronomical studies.


Key words: ISM: molecules -- methods: laboratory -- molecular data -- ultraviolet: ISM




© ESO 2004


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