Modeling of iron K lines:: Radiative and auger decay data for FeII-FeIX

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. Different branching ratios, namely Kalpha(2) /Kalpha(1), Kbeta/ Kalpha, KLM /KLL, KMM /KLL, and the total K-shell fluorescence yields, omega(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 Kalpha(2) /Kalpha(1) ratio is found to be sensitive to the excitation mechanism. From these comparisons it has been possible to estimate an accuracy of similar to 10% for the present transition probabilities.