Modeling of Iron K Lines: Radiative and Auger Decay Data for Fe II-Fe IX

A detailed analysis of the radiative and Auger de-excitation channels of K-shell vacancy states in Fe ii-Fe ix has been carried out. Level energies, wavelengths, A-values, Auger rates and fluorescence yields have been calculated for the lowest fine-structure levels populated by photoionization of the ground state of the parent ion. Dierent branching ratios, namely K2/K1 ,K /K ,K LM/KLL, KMM/KLL, and the total K-shell fluorescence yields, !K, obtained in the present work have been compared with other theoretical data and solid-state measurements, finding good general agreement with the latter. The K2/K1 ratio is found to be sensitive to the excitation mechanism. From these comparisons it has been possible to estimate an accuracy of10% for the present transition probabilities.

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