The QEXAFS-monochromator allows to measure an EXAFS-scan in 50ms. The monochromator oscillates while the intensity in ion-chambers and total-fluorescence yield detectors is measured with fast and high-resolution analog-to-digital converters.
Special ion-chambers were designed for these fast measurements. Normal ion-chambers suffer from the slow velocity of the heavy ions, while the lighter electrons are collected quickly. Therefore, a Frisch-Grid was installed in these ion-chambers, which collect the heavy ions and separate their signal from that of the lighter and quicker electrons.
The entire QEXAFS-system (monochromator, ion-chambers, fast amplifiers) were designed and built by the group of Ronald Frahm at the University of Wuppertal. Please contact Prof. Dr. Ronald Frahm or Dr. Benjamin Bornmann before submitting a proposal for the QEXAFS-Monochromator.
Benjamin Bornmann, Jonas Kläs, Oliver Müller, Dirk Lützenkirchen-Hecht, and Ronald Frahm
The quick EXAFS setup at beamline P64 at PETRA III for up to 200 spectra per second
AIP Conference Proceedings 2054, 040008 (2019);
DOI: 10.1063/1.5084609
The BMBF funded the project 05K16PX1 QEXAFS, titled "Neue Instrumentierung für zeitaufgelöste QEXAFS-Spektroskopie" from Bergische Universität Wuppertal (R. Frahm).