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Welcome to TOPbase [1, 2], the Opacity Project [3] on-line atomic database. TOPbase contains the most complete dataset of LS-coupling term energies, f-values and photoionization cross sections for astrophysical abundant ions (Z=1-26) that is currently available. They have been computed in the close-coupling approximation [4] by means of the R-matrix method [5] with innovative asymptotic techniques [6]. In most cases the accuracy of the data is comparable with that obtained by other state-of-the-art atomic physics numerical approaches. TOPbase also contains large datasets of f-values for ions of Fe with configurations 3sx3py3dz, referred to as the PLUS-data [7], computed with the atomic structure code SUPERSTRUCTURE [8].
You can either ftp the original raw files or make use of the interactive searching facilities to display custom views of:


  1. Cunto W., Mendoza C., 1992, Rev. Mexicana Astron. Astrofis. 23, 107. Abstract
  2. Cunto W., Mendoza C., Ochsenbein F., Zeippen C.J., 1993, A&A 275, L5. Abstract
  3. The Opacity Project Team, 1995, The Opacity Project Vol. 1, Institute of Physics Publications, Bristol, UK
  4. Burke P.G., Seaton M.J., 1971, Meth. Comput. Phys. 10, 1
  5. Burke P.G., Hibbert A., Robb W.D., 1971, J. Phys. B 4, 153. Abstract
  6. Seaton M.J., 1985, J. Phys. B 18, 2111. Abstract
  7. Lynas-Gray A.E., Seaton M.J., Storey M.J., 1995, J. Phys. B 28, 2817. Abstract
  8. Eissner W., Jones M., Nussbaumer H., 1974, Comput. Phys. Commun. 8, 270. Abstract

For further enquiries or user support, contact:
Claudio Mendoza
Physics Center, IVIC, Caracas, Venezuela.
Claude Zeippen
Observatoire de Paris, Meudon, France.
Anil Pradhan
Astronomy Department, Ohio State University, Columbus, USA.
Franck Delahaye
Observatoire de Paris, Meudon, France.

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Last Update: 24-Feb-2009