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Studies pre-edge features of iron complexes using X-ray absorption spectroscopy. Types of ligating atoms; Relative intensities of electric quadrupole transitions; Characterization of iron active sites.

Investigates the geometric structure of the catalytically relevant ferrous active site of phenylalanine hydroxylase (PAH). Observation of the low ligand field strength; Use of the magnetic circular dichroism and X-ray absorption; Effects of the substrate-induced allosteric activation on the structure of iron site.

Presents the background and theoretical description of the GNXAS, an integrated approach to the analysis of extended X-ray absorption fine structure method. Comparison of Fe(acac)3 GNXAS distance and angle fitting results to crystallographic values; Molecular structure of Fe(acac); Angle dependence of the Fe-C-N multiple scattering contribution in K3Fe(CN)6.

Probes the oxidation and spin state of the iron in activated bleomycin using X-ray absorption spectroscopy. Determination of the presence of a short iron-oxo bond; Pre-edge and edge regions of the Fe K-edge spectra; Bond distances.

Characterizes extended X-ray absorption fine structure (EXAFS) data on a series of {FeNO}7 model compounds using a theoretical data analysis package GNXAS. GNXAS fits; Angle determination; Models.