SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 39: Poster Session: Heterogeneous Catalysis and Surface Dynamics
O 39.6: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Laser pump X-ray probe investigations of the dynamics at the liquid-vapour interface of alkali halogenide salt solutions — •Lukas Petersdorf1, Svenja Hövelmann1,2, Rajendra Giri1, Nicolas Hayen1, Karin Hansen1, Philipp Jordt1, Andrea Sartori1, Matthias Greve1, Florian Bertram2, Olaf Magnussen1, and Bridget Murphy1,3 — 1University of Kiel (IEAP), Kiel — 2DESY, Hamburg — 3RHL, Kiel
Detailed knowledge of the surface of alkali halogenide solutions is fundamental for understanding atmospheric effects and developing technological applications such as solar thermal cells. Surface dynamics of such systems ranging from fs to s, can be studied in detail by pump-probe techniques. Our Laser pump-X-ray probe studies are based on photoionization processes at the interface induced by a 258 nm laser pulse and pumping electron solvation dynamics and ion rearrangements. With auspicious quantum yield and surface structure, the pump-probe studies were performed on salt solutions (NaI, RbBr, ErCl3). We apply the surface sensitive techniques time resolved XRR and GIXRF to investigate the responding structural changes. A sensor monitored sample environment allows us to distinguish between laser induced and solution dependent dynamics. Upon laser excitation, changes in the specular reflectivity occur on the ms to s scale. Electron density and surface roughness change near the interface indicate a rearrangement of the ion concentration. Within the framework of the DAPHNE4NFDI project, the analysis will be supported by artificial neural networks in order to allow in-operando experimental decisions.