Dresden 2026 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 6: Upper Atmosphere, Polar Chemistry and Volcanic Aerosols
UP 6.1: Vortrag
Mittwoch, 11. März 2026, 09:30–09:45, MER/0002
Twofold Chemical Properties of Premelting at Ice Surfaces — •Thorsten Bartels-Rausch1, Jérôme Gabathuler1, Yanisha Manoharan1, Luca Artiglia1, Markus Ammann1, Rawan Abouhaidar2, Céline Toubin2, and Ivan Gladich3 — 1Paul Scherrer Institute, Villigen, Switzerland — 2Universite de Lille, Lille, France — 3University of Urbino, Urbino, Italy
The physical properties of ice surfaces are a longstanding subject of intense research motivated by their relevance in glacial flow, thunder, (anti-)freezing, and on-water catalysis. How water molecules re-arrange at the surface to minimize energy, going as far as evolving liquid-like features in premelting, is under ongoing investigation. Less elusive remains the impact of this disorder on chemistry. This is problematic considering the role of ice and snow interfaces in chemical processes, such as global geochemical cycles. This work presents hexylamine adsorption as a means to investigate the chemical characteristics of the ice- and water-air interface. By analyzing the X-ray photoemission spectra of the adsorbate at the air-ice interface against those at the air-water interface, we discovered experimental evidence indicating differing chemical interactions at these two interfaces. Molecular dynamics and core binding calculations linked these spectroscopic differences to an active interfacial proton transfer.
Keywords: ice; water; interface; acid-base; solvation