Abstract
Fe Kα3,4 satellite spectra are investigated using a Johann-type spectrometer at the BL15XU undulator beam line, SPring8. Intensity of the Kα3,4 satellite relative to the Kα1 emission line is found to increase asymptotically with excitation energy up to 9000 eV, and almost saturates at around 9500 eV. Satellite threshold energy is found to be 7882 eV ± 14 eV. This corresponds to the ionization energy of Fe + 1s2p*, where * indicates that the value is from the Z + 1 approximation. The growth of satellite intensity with the excitation energy suggests that the 2p spectator holes are mainly created by shake-off in Fe, as suggested by Fritsch et al. [Phys. Rev. A 57, 1686 (1998)] in a previous work on copper.
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