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DY: Fachverband Dynamik und Statistische Physik
DY 20: Focus Session: Water – from Atmosphere to Space I (joint session CPP/DY)
DY 20.5: Talk
Tuesday, March 10, 2026, 10:45–11:00, ZEU/LICH
Monitoring Uptake, Release and Reaction of Gases at the Liquid-Vapor Interface — •Tillmann Buttersack1, Shirin Gholami1, Clemens Richter1, Daniela Torres-Diaz1, Bernd Winter1, Pavel Jungwirth2, Stephen Bradforth3, Markus Ammann4, Ruth Signorell5, Ivan Gladich6, Remi Dupuy7, Philip Mason2, and Hendrik Bluhm1 — 1Fritz Haber Institute, Max Planck Society, Berlin, GER — 2IOCB, Czech Academy of Sciences, Prague, CZ — 3University of Southern California, Los Angeles, USA — 4Paul Scherrer Institut, Villigen, CH — 5EZH Zürich, CH — 6University of Urbino, Urbino, I — 7Sorbonne Université, Paris, F
Multiphase reactions are omnipresent in nature, industrial applications. The direct observation of reactions at the liquid-vapor interface requires spectroscopic techniques that are surface specific and chemically sensitive to detect low concentrations, e.g., photoelectron spectroscopy (XPS). Furthermore, the sample delivery method must allow sufficient time for an interface reaction to proceed. These complex challenges require individual approaches for each system of interest. One example for a multiphase process is the reaction between liquid alkali metal and water vapor, which is extremely fast. We used a slow droplet train of NaK in a wet atmosphere and observed the formation of golden aqueous solutions with metallic properties with XPS. An example with relevance for atmospheric chemistry is the formation and the release of sulfur dioxide (SO2) from aqueous sulfite solutions due to acidification. We demonstrated that dissolved gases can be detected with XPS even though their concentration is only about 1 mM.
Keywords: liquid-vapor interface; xps