Photoionization Modeling: the K Lines and Edges of Iron Dr. Patrick Palmeri, T.R. Kallman, C. Mendoza, M.A. Bautista, J. Krolik Astrophysique et Spectroscopie - UMH 20 Place du Parc B-7000 Mons, Belgium We calculate the efficiency of iron K line emission and iron K absorption in photoionized models using a new set of atomic data. These data are more comprehensive than those previously applied to the modeling of iron K lines and edges from photoionized gases, and allow us to systematically examine the behavior of the properties of line emission and absorption as a function of the ionization parameter, density and column density of model constant density clouds.