Abstract
Calculations are presented for the photoionization cross section of the neutral iron atom for photon energies from threshold to 10 keV. Our results are based upon the use of nonrelativistic wave functions and the dipole approximation. Correlations are included to low orders by the use of many-body perturbation theory; and the cross section including correlations is found to differ greatly from that obtained from the Hartree-Fock approximation. Hartree-Fock results are also presented for comparison. We roughly estimate our cross section, including correlations near threshold, to be accurate to within a factor of 2 when integrated over a few eV.
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