Astron. Astrophys. 346, 699-704 (1999)

Ab initio calculation of the dipole transition moment and band oscillator strengths of the CO (A-X) transition

A. Spielfiedel ¹, W.-ÜL. Tchang-Brillet ^1,2, F. Dayou ¹ and N. Feautrier <sup>1

1</sup> DAMAP and URA 812 du CNRS, Observatoire de Paris, F-92195 Meudon Cedex, France
² Université Pierre et Marie Curie, 4, Place Jussieu, F-75252 Paris Cedex 05, France

Received 10 August 1998 / Accepted 8 April 1999

Abstract

Band-integrated oscillator strengths of the CO transition for and have been calculated from an ab initio dipole transition moment given by highly correlated electronic wave functions. The calculations were carefully optimized to represent the dipole transition moment in the large range of internuclear distances necessary to describe correctly high vibrational levels. The computed oscillator strengths agree well with the more recent experimental data available for . By comparing the present results with previous theoretical works, we estimate that the resulting line strengths for the higher vibrational levels should be the most accurate to date.

Key words: molecular data ISM: molecules ultraviolet: ISM

Send offprint requests to: A. Spielfiedel

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Contents

• 1. Introduction
• 2. Summary of the ab initio calculation
• 3. Spectroscopic constants and dipole transition moment
• 4. Oscillator strengths
• 5. Numerical accuracy
• 6. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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