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Fe Kα 3,4 satellite spectra are investigated using a Johann-type spectrometer at the BL15XU undulator beam line, SPring-8. The intensity of the Kα 3,4 satellite relative to the Kα 1 emission line is found to increase asymptotically with excitation energy up to 9000 eV, almost saturating at 10 000 eV. The satellite threshold energy is found to be 7882 ± 14 eV. This corresponds to the ionization energy of Fe 1s + 2p * , where * indicates that the value is from the Z + 1 approximation. The appearance of a small peak around the [1s2s] double ionization energy suggests that the satellite intensity with the excitation energy can be increased not only by the formation of the 2p spectator holes, but also by a combination of the [1s2s] resonance and [2s2p] Coster-Kronig transition.

K x‐ray emission spectra of Ni were measured in bis(N‐isopropylsalicylideneaminato)nickel(II) and bis(N‐isobutylsalicylideneaminato)nickel(II) with different types of coordination, planar or pseudo‐tetrahedral, using a double‐crystal x‐ray spectrometer. The relationship between the magnetic susceptibility and the energy spectra of the Kβ2,5 and Kβ′ emission lines was investigated for these compounds. The electronic structures of the compounds were also studied by the use of the molecular orbital method. Copyright © 1999 John Wiley & Sons, Ltd.