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5. Conclusion

Extensive radiative calculations for Fe IV are presented which are expected to be applicable to a variety of astrophysical problems such as the calculation of improved Iron opacities, non-LTE models, and spectroscopic interpretation of Fe IV spectra. The present calculations include a number of target terms of both parities and therefore exhibit resonance structures absent from previous calculations, especially the near-threshold resonance structure in the ground state photoionization cross section. Oscillator strengths for 34 635 dipole allowed transitions among the quartet and the sextet terms in Fe IV were calculated. This data set expands the data set of transitions currently in the Opacity Project database TOPbase (Cunto & Mendoza 1993) and should be more accurate than that of SB.

All radiative data reported here will be included in TOPbase at CDS (Cunto etal. 1993). These data can also be accessed electronically via Internet by request to the authors.


We would like to thank Dr. Sultana Nahar for her assistance in the identification of bound states. We also thank Dr. Divid Hummer, the co-ordinator of the Iron Project, for comments and suggestions that improved this manuscript. This work was supported in part by the U.S. National Science Foundation (PHY-9421898) grant for the Iron Project. The computations were carried out in part on the Cray T3D at the Ohio Supercomputer Center (OSC).

Copyright by the European Southern Observatory (ESO)