Abstract
New structure has been resolved in the X-ray K absorption edge of nickel. There is rough qualitative agreement between our spectrum and the calculations of Nagel et al., for which the presence of the core hole is neglected in the computation of the final state wave function. However, the two lowest energy experimental peaks are significantly shifted to lower energies relative to the corresponding theoretical peaks. In addition, the theoretical spectrum is much sharper than the experimental curve even after accounting for instrumental broadening and broadening due to the natural width of the K level, indicating that hot electron broadening effects strongly influence the final ejected electron states.
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