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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Focus Session: Water – from Atmosphere to Space III (joint session CPP/DY)

CPP 27.3: 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