Can current experimental techniques and analytical procedures produce x-ray absorption fine structure (XAFS) which is independent of the beam line or synchrotron used? We investigate the consequence upon XAFS interpretation of typical systematic errors, including determination of the edge energy, detector response and synchrotron bandwidth. Using the highest accuracy data set of the mass-attenu...

The problem of impurities and defect states in lead telluride-based semiconductors is of crucial importance for their practical applications. X-ray absorption fine structure (XAFS) techniques are capable to address some of the key issues regarding impurities position, their valent state, as well as the local structural changes of the host lattice in the immediate surrounding of the impurity ato...

Amorphous Ta-oxide and Sn-nitride thin films were prepared by reactive sputter deposition on smooth float glass substrates and investigated ex situ using reflection mode XAFS. The absorption coefficient mu and its fine structure were extracted from the measured reflection mode XAFS spectra with a method based on the Kramers-Kronig transform. Bond distances, coordination numbers and Debye-Waller...

Micro-X-ray fluorescence and X-ray absorption fine structure (µ-XRF-XAFS) is one of the most powerful tools to identify distribution speciation trace elements in natural samples with µm spatial resolution. However, conventional µ-XRF-XAFS studies applied rare earth (REEs: lanthanide + Y this study) are mainly limited their L-edges L lines (except for Y) that subject strong interferences from ot...

We present the design and performance of a high-temperature in situ cell with a large solid angle for fluorescence X-ray absorption fine structure (XAFS) spectra. The cell has a large fluorescence XAFS window (116 mm(ϕ)) near the sample in the cell, realizing a large half-cone angle of 56°. We use a small heater (25 × 35 mm(2)) to heat the sample locally to 873 K. We measured a Pt-SnO2 thin lay...

We have developed a compact experimental set-up for X-ray absorption fine structure (XAFS) measurements in He gas under atmospheric pressure (AP) in the soft X-ray region and used it for Mg and Cl K-edge XAFS measurements of MgCl2 and MgCl2・6H2O. The spectra of MgCl2・6H2O measured in He under AP were significantly different from those measured in vacuum. This suggests the importance of performi...

To Investigate the role played by nickel co-ions in contributing to the stability of arsenic, fluorescence XAFS measurements at both arsenic K-edge and nickel K-edge, respectively, on amorphous arsenical nickel hydroxide, crystalline arsenical nickel hydroxide, and annabergite reference compounds have been carried out. The XAFS results indicate that the arsenic-bearing nickel hydroxides have a ...

To discuss the local structure of an atom in the self-organized InAs quantum dot (QD), we perform a site-selective X-ray absorption fine structure (XAFS) measurement, employing the capacitance XAFS method. Since the X-ray-induced photoemission of confined electrons in a QD via inner-shell absorption can be detected by capacitor, the photon energy dependence of the capacitance provides the XAFS ...

X-ray absorption fine structure (XAFS) spectra in the soft X-ray region are obtained in the electron and fluorescence yield modes, which are sensitive to surface and bulk, respectively. A micro-channel plate (MCP) can be used as the detector for the total fluorescence yield (TFY) method by applying a sufficiently high negative bias to a grid in front of the MCP. However, this method often suffe...

The kinetics of mixed Ni-Al layered double hydroxide (LDH) precipitate formation on a soil clay fraction was monitored using X-ray absorption fine structure (XAFS) spectroscopy. The kinetic behavior was monitored at pH 6.0, 6.8, and 7.5 in order to determine the effect of reaction pH on precipitate formation. XAFS analyses were performed on a Ni-reacted whole soil at pH 7.5 to determine the eff...