  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
K-alpha_2/K-alpha_1, K-beta/K-alpha, 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 K-alpha_2/K-alpha_1 ratio is found to be
sensitive to the excitation mechanism. From these comparisons it has been
possible to estimate an accuracy of ~10% for the present transition
probabilities.
