XANES@KMC-2

The instrument is located at the KMC-2 beamline, which provides linearly polarized light in the energy range of 4 keV – 15 keV for X-ray absorption spectroscopies (EXAFS, XANES), fluorescence, diffractometry and reflectometry. Beam intensity is stabilized by MOSTAB electronics with an accuracy of 0.3 %. KMC-2 XANES is a dedicated instrument for X-ray Absorption Spectroscopy measurements at-air. The experimental setup allows for a parallel monitoring of the transmitted through the sample X-ray beam intensity as well as for fluorescence yield measurements.

Selected Applications:

• investigate the short-range environment around selected atomic species in condensed matter
• study structural properties in various materials like: liquids, molecular solutions, liquid crystals; single- and poly-crystalline materials; amorphous and highly disordered solids; molecules and macromolecules containing metallic atoms or partially substituted with heavy atoms

Methods

EXAFS, NEXAFS, XRF, XRF Mapping

Remote access

not possible

Instrument application

X-ray Absorption Spectroscopy (XAS) is a powerful structural technique to investigate the short-range environment around selected atomic species in condensed matter. While scanning the x-ray energy impinging onto the sample, a core level photoelectron is generated. This is scattered by the surroundings matter producing interference effects visible in the absorption cross-section and usually referred to as x-ray absorption fine structure (XAFS). The process itself is general and therefore fundamental to study structural properties in materials like:

• liquids, molecular solutions, liquid crystals
• single- and poly-crystalline materials
• amorphous and highly disordered solids
• molecules and macromolecules containing metallic atoms or partially substituted with heavy atoms

The energy range 4.0 keV < E < 15 keV is sufficient for K-edge studies of elements in the range 21 < Z < 36 and L-edge studies of elements in the range 49 < Z < 83. The sample thicknesses for experiments are in the µm range for transmission experiments. However, thin film and/or dilute systems studies are still possible in fluorescence mode.