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DY: Fachverband Dynamik und Statistische Physik
DY 24: Focus Session: Water – from Atmosphere to Space II (joint session CPP/DY)
DY 24.2: Vortrag
Dienstag, 10. März 2026, 11:30–11:45, ZEU/LICH
Surface Propensity of Halide Ions in Water: New Evidence from LJ-XPS — •Daniela Torres-Díaz1, Shirin Golami1, Tillmann Buttersack1, Qi Zhou1, Rémi Dupuy2, Bernd Winter1, Chistophe Nicolas3, and Hendrik Bluhm1 — 1Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 2Laboratoire de Chimie Physique - Matière et Rayonnement (Sorbonne Université, CNRS), Paris, France — 3Synchrotron SOLEIL, Saint-Aubin, France
The surface propensity of halide ions in water is still a matter of debate. While the famous Onsager&Samaras model indicates that charged species should avoid the interface, more recent Molecular Dynamics simulations that take into account the polarizability of the ions indicate notably that iodide and bromide prefer the interface while chloride and fluoride avoid it. Different models, however, differ in how strong this effect is, while experimental studies have reported contradictory results. Here I will discuss recent results obtained using Liquid-Jet X-Ray Photoemission Spectroscopy on water interfaces for potassium halide solutions. In particular, the measurement of the photoelectron angular distributions allow for a higher spatial resolution than classic XPS measurements.
Keywords: Liquid-vapor interface; XPS