Dresden 2026 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Focus Session: Water – from Atmosphere to Space I (joint session CPP/DY)
CPP 19.4: Vortrag
Dienstag, 10. März 2026, 10:30–10:45, ZEU/LICH
Laser-Excited X-ray Reflectivity of Aqueous SrCl2 at the Air-Water Interface — •Ali Ashtiani Abdi1,2, Julia Kobus1,2, Svenja C. Hövelmann1,2, Philipp Jordt1,2, Nicolas Hayen1,2, Prashant Hitaishi1,2, Ajay Ajay1,2, Rabia Qamar1,2, Otto Lippmann1,2, Chen Shen3, Florian Bertram3, and Bridget M. Murphy1,2 — 1IEAP, CAU Kiel University, Kiel, Germany — 2Ruprecht Haensel Laboratory, DESY, Hamburg, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
Understanding aqueous interfaces is essential for describing chemical processes in atmospheric, marine, and geochemical environments. While monovalent salts have been widely studied, the interfacial behavior of divalent ions is less understood, despite their relevance in seawater aerosols and reactive brines. SrCl2 is a representative divalent electrolyte whose interfacial structure may show alteration by laser illumination.
We investigate aqueous SrCl2 solutions at different concentrations using X-ray reflectivity (XRR) at the liquid-air interface. Measurements were performed at the LISA setup at beamline P08, PETRA III (DESY), where controlled laser illumination can be applied directly to the X-ray footprint, following the instrumentation concept of Warias and Hovelmann et al. (J. Synchrotron Rad. 2024). Reflectivity curves were recorded with and without laser exposure. The data demonstrate the suitability of SrCl2 surfaces for laser-assisted XRR and the sensitivity of the method to potential changes in interfacial structure, including indications of near-surface layering.
Keywords: water interface; X-ray reflectivity; laser illumination; strontium chloride; ion layering