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5 Conclusion

Accurate and large-scale datasets of level energies and fine structure transition probabilities for Fe XXIV and Fe XXV are reported under the Iron Project. The transitions include both the dipole allowed and intercombination obtained in intermediate coupling including relativistic effects through the Breit Pauli R-matrix method (BPRM) in the close coupling approximation. Both the energies and the transition probabilities agree generally to within $1 - 10\%$ with nearly all of the most accurate calculated and measured values available. It might be concluded that for highly charged ions the relativistic and QED effects omitted from consideration in the BPRM calculations should lead to an error not exceeding the estimated uncertainty. However, much more work needs to be done to investigate the precise magnitude of the various effects on increasingly complex atomic systems. Calculations are presently under way for Fe V and Fe XVI. We should expect the present data to be particularly useful in the analysis of X-ray and Extreme Ultraviolet spectra from astrophysical and laboratory sources where non-local thermodynamic equilibrium (NLTE) atomic models with many excited levels are needed.

Acknowledgements

This work was partially supported by U.S. National Science Foundation (AST-9870089) and the NASA ADP program. We should like to thank Dr. Gordon Drake and Dr. Ulyana Safronova for communications. The computational work was carried out on the vector machine Cray T94 at the Ohio Supercomputer Center in Columbus, Ohio.


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