Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster: Surface Reactions

O 35.4: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Grazing incident extended X-ray absorption fine structure on liquids at Beamline P64 at Petra III — •Lukas Voß, Dirk Lützenkirchen-Hecht, Frederic Braun, Franz Eckelt, and Carlo Schneider — Bergische Universität Wuppertal, NRW

The existing setup for grazing incidence X-ray absorption spectroscopy at Beamline P64, PETRA III, has been expanded to accommodate liquid samples. This enhancement involved the integration of a mirror device in front of the reflectometer, redirecting the X-ray beam downward onto the liquid sample surface. The adjustable mirror facilitates variations in both height and angle, enabling diverse incident angles on the surface. Leveraging this improved configuration, our investigation focused on the formation of germanium nanoparticles on the surface of deionized water. The high-speed scanning monochromator at P64 allowed for the rapid acquisition of complete EXAFS spectra within fractions of a second. Consequently, we successfully captured the exceedingly swift reaction between germanium(IV)-isopropoxide and water in situ. To further advance our capabilities, a specialized liquid sample chamber is currently under construction. This chamber aims to facilitate the study of surface reactions in liquids at controlled gas interfaces and temperatures. Its versatile design enables the detection of the reflected X-ray beam for Refl-EXAFS, while also facilitating fluorescence detection using a PIPS detector. This integrated approach enhances our ability to comprehensively investigate and analyze diverse liquid systems, such as e.g. Langmuir-Blodgett-films, providing valuable insights into surface interactions.

Keywords: EXAFS; Xray; grazing incidence; liquids; surface