Berlin 2012 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 3: Vacuum Systems and Tools

VA 3.1: Vortrag

Montag, 26. März 2012, 14:40–15:00, HFT-FT 131

Fast Ionization Chambers for Time Resolved XAFS Measurements — •Oliver Müller, Dirk Lützenkirchen-Hecht, and Ronald Frahm — Bergische Universität Wuppertal

Time resolved XAFS (X-ray Absorption Fine Structure) methods, e.g. QEXAFS (Quick Extended X-ray Absorption Fine Structure) is a valuable tool for in situ investigations of materials of any kind. The increase in intensity at modern 3rd generation synchrotron radiation sources allow the acquisition of complete EXAFS spectra within a few milliseconds. To meet the increasing demand in time resolution and data quality specialized high speed ionization chambers have been build. By introducing a Frisch grid, the bandwidth of the ionization chambers could significantly be extended. It was shown that the improved step response of the new ionization chamber yield higher energy resolution of EXAFS spectra at very high acquisition frequencies.