Extensive radiative data: energy levels, dipole oscillator strengths, and partial and total photoionization cross sections for Fe I are presented. Most of these data were calculated for the first time and are expected to provide a reasonably complete dataset for Fe I to be used in astrophysical models.
Total and partial photoionization cross sections for all bound states
of Fe I have been obtained, carefully delineating the autoionizing resonance
structures. The cross section of the ground
state, 
, was
compared with previous theoretical calculations in central field approximations
and differences of over three orders of magnitude
were found. Much better agreement for this cross section was found with
earlier work by Kelly & Ron (1972) and Kelly (1972)
using the many-body perturbation theory.
All the data reported here should be available in the near future from the Opacity Project data server TOPbase (Cunto et al. 1995; Mendoza 1995, private communication).
The complexity of the present computations can be inferred from the fact that they required two years of almost uninterrupted computations and about 1500 CPU hours on the Cray Y-MP8/64.
Acknowledgements
I would like to thank Prof. Anil Pradhan for suggesting this work and for discussions and comments. I also appreciate the assistance of Dr. Sultana Nahar for the identification of bound states. 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 on the Cray YMP8 at the Ohio Supercomputer Center (OSC).