Astron. Astrophys. 346, 705-712 (1999)

Experimental determination of the band oscillator strengths of the CO A(11v'23)-X(v"=0) made at the LURE-SuperACO synchrotron facility.

M. Eidelsberg ¹, A. Jolly ¹, J.L. Lemaire ^1,2, W.-ÜL. Tchang-Brillet ^1,3, J. Breton ^4,5 and F. Rostas <sup>1

1</sup> DAMAP et URA 812 du CNRS, Observatoire de Paris-Meudon, F-92195 Meudon Cedex, France
² Université de Cergy-Pontoise, Centre de Neuville, F-95031 Cergy-Pontoise Cedex, France
³ Université Pierre et Marie Curie, 4 pl. Jussieu, F-75252 Paris Cedex 05, France
⁴ Université Pierre et Marie Curie - ESVUV, Case 081, 4 pl. Jussieu, F-75252 Paris Cedex 05, France
⁵ Université Paris-Sud, F-91405 Orsay Cedex, France

Received 10 August 1998 / Accepted 16 November 1998

Abstract

The band-integrated absorption oscillator strengths of the CO A(11v'23)-X(v"=0) transition have been measured using monochromatized synchrotron radiation from the LURE-SuperACO facility as background source. The absorption spectra were analyzed using the simulation-fitting technique described in an earlier publication (Jolly et al. 1997). Up to v'=20, the results are in good agreement with very recent ab initio calculations (Spielfiedel et al. 1999) and VUV laser measurements(Stark et al. 1998). For v'=23 which is measured here for the first time, and for v'=21 the measured oscillator strengths are found to be significantly larger than the calculated ones. Combining experimental and calculated results, a set of recommended oscillator strengths is proposed.

Key words: molecular data ISM: molecules ultraviolet: ISM

Send offprint requests to: M. Eidelsberg (eidelsberg@obspm.fr)

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Contents

• 1. Introduction
• 2. Experiments
  • 2.1. Experimental setup
  • 2.2. Data analysis
• 3. Results and discussion
  • 3.1. CO A-X bands
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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