Multiple photoionization cross sections for Fe²⁺ K shell

Abstract

Multiple photoionization cross sections from the K shell are studied for all levels of the Fe2+ 3d6 configuration. The study shows that the quadruple photoionization leads to the largest cross sections. A large variation in the multiple photoionization cross sections is determined among the levels of the Fe2+ 3d6 configuration. Main decay branches of radiative and Auger cascades, following the photoionization of the K shell for the ground configuration of the Fe2+ ion, are identified. The radiative and Auger cascade is studied by considering transitions among energy levels and subconfigurations. The obtained data for ion yields are compared with previous calculations produced for configuration averages.

Cross sections of cascade production of photoions after photoionization of the iodine atom in the 0.01–100 keV incident photon energy range

“…The spectra differ substantially in the ion charge range of 5 to 7: our calculation predicts greater probabilities for +7 ions and smaller probabilities for +5 and +6 ions. Based on their earlier results on the decay of the 1s-vacancy in Fe [63] and Fe 2+ ion [64] where they considered multiplet splitting of the cascade ionic subconfigurations and did thorough level-to-level calculations of the transition probabilities, the authors of [35] supposed that their iodine K-vacancy decay charge spectrum may be shifted to lower ionic charge states since they did not include multiplet splitting of the cascade ionic subconfigurations. To verify this supposition, we did the calculation of the 1s vacancy decay spectra without accounting for the multiplet splitting, i.e.…”