Introduction to X-Ray Absorption Spectroscopy

Analysis of K‐absorption extended X‐ray absorption fine structure data of some transition metals

“…[7] The value of (R 1 À a 1 ) and b 1 has been determined from the slope and the intercept, respectively, of these plots. These values of (R 1 À a 1 ) and b 1 have been used to obtain the phase factor, which has been used as input in Eqn (3). The backscattering amplitude F j (k) has been taken from two sources, i.e.…”

“…XANES is strongly sensitive to formal oxidation state and coordination chemistry (e.g. octahedral, tetrahedral coordination) of the absorbing atom, whereas the EXAFS is used to determine the distances, coordination numbers and species of the neighbors of the absorbing atom …”

“…octahedral, tetrahedral coordination) of the absorbing atom, whereas the EXAFS is used to determine the distances, coordination numbers and species of the neighbors of the absorbing atom. [1][2][3] The commonly used methods of EXAFS data analysis require expertise and are time-consuming. The aim of the present work is to describe a simplified EXAFS analysis method using MATHCAD programming.…”

Cation Disorder and Local Structural Distortions in AgxBi1–xS2 Nanoparticles

“…We have used X-ray absorption fine structure (XAFS) and X-ray diffraction (XRD) aided by DFT ab initio and molecular dynamics (MD) simulations. Owing to its chemical selectivity and sensitivity, XAFS [8] is the premier experimental tool to measure interatomic distances in the first few coordination shells and to probe the relative atomic arrangement in condensed matter, in particular, in alloys; a further attractive feature is the applicability to ordered or disordered materials both in the bulk or as nanostructures. A limitation of XAFS is its insensitivity to lattice symmetry, which, along with the local atomic arrangement, also plays a fundamental role in determining physical properties.…”

Mechanochemical Preparation and Structural Characterization of Layered Double Hydroxides and their Amino Acid-Intercalated Derivatives

“…Figure 10. Schematic explanation of the EXAFS phenomenon: X-ray photon absorption (left), emission of photoelectron spherical wave (center), backscattering of the photoelectron by neighboring atoms [150] The basic information that can be obtained from the analysis of the EXAFS spectra This method is most frequently used in the determination of the local structure in noncrystalline materials, for the determination of the local environment in of the atoms in heterogeneous matrices, for systems with local properties different from average properties, and for the determination of the dynamics in crystalline solids.…”