5 Conclusion

We have described some of the first large-scale ab initio relativistic calculations of transition probabilities now in progress under the Iron Project. Large datasets for the fine structure energy levels and oscillator strengths for the carbon like Ar XIII and Fe XXI are presented and the amount exceeds considerably the presently available data. All the calculated energy levels, 1274 for Ar XIII and 1611 for Fe XXI, have been spectroscopically identified and checked for completeness. All data are available electronically. Part of the f-values have been reprocessed using available observed energies for better accuracy.

Acknowledgements

This work was partially supported by U.S. National Science Foundation (AST-9870089) and NASA (NAG5-7903). The computational work was carried out on the Cray T94 at the Ohio Supercomputer Center in Columbus, Ohio.