Dresden 2026 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 26: Focus Session: Water – from Atmosphere to Space III (joint session CPP/DY)
DY 26.3: Vortrag
Dienstag, 10. März 2026, 14:45–15:00, ZEU/LICH
Photoelectron Angular Distributions of Ions Influenced by Surfactants at the Solution-Vapor Interface — •Shirin Gholami1, Tillmann Buttersack1, Clemens Richter2, Rémi Dupuy3, Daniela Torres-Díaz1, Christophe Nicolas4, Uwe Hergenhahn1, and Hendrik Bluhm1 — 1Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 2SPECS Surface Nano Analysis GmbH, Berlin, Germany — 3Sorbonne Université, CNRS, Paris, France — 4Synchrotron SOLEIL, Paris, France
Aqueous liquid-vapor interfaces play key roles in atmospheric and oceanic processes. The ocean-air boundary forms the largest aqueous-vapor interface, covering over 70 % of Earth’s surface. In addition to Na+ and Cl−, Mg2+ and SO42− are the most abundant ions in ocean water.
Here, we investigate how Mg2+ and SO42− ions behave at the aqueous solution-vapor interface in the presence of charged surfactants. Using sub-monolayer coverages of octylamine −CNH3+ and octanoate −COO−, we examine how these surfactants modify the distance of the ions from the interface. Liquid-jet X-ray photoelectron spectroscopy in combination with photoelectron angular distributions provides Å-scale depth sensitivity, enabling us to quantify ion-surfactant interactions.
Our results show that differently charged surfactants shift the interfacial positioning of Mg2+ and SO42−, and that specific ion-ion interactions influence their interfacial propensity.These findings reveal how surfactants govern the depth distribution of ions, providing insight into oceanic and atmospheric processes.
Keywords: liquid-vapor interface; X-ray photoelectron spectroscopy; ocean water