Two-electron one-photon x-ray transition energies are calculated, using the Slater transition-state concept within the approximate local density-functional theory given by the X{α} model, for the krypton atom and isoelectronic Rb, Yt, and Zr, respectively. The new theoretical results suggest that the transition energy is a linear function of the atomic number within the isoelectronic series.
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Vinayagam et al. (1987) studied this question.
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