heterogeneous chemistry; atmospheric chemistry; aerosol; uptake coefficient; halogens; sea spray aerosol; photochemistry; nitrogen oxides; ice nucleation; mineral dust; X-ray photoelectron spectroscopy
Yang Huanyu, Boucly Anthony, Gabathuler Jérôme Philippe, Bartels-Rausch Thorsten, Artiglia Luca, Ammann Markus (2021), Ordered Hydrogen Bonding Structure of Water Molecules Adsorbed on Silver Iodide Particles under Subsaturated Conditions, in The Journal of Physical Chemistry C
, 125(21), 11628-11635.
Gladich Ivan, Chen Shuzhen, Vazdar Mario, Boucly Anthony, Yang Huanyu, Ammann Markus, Artiglia Luca (2020), Surface Propensity of Aqueous Atmospheric Bromine at the Liquid–Gas Interface, in The Journal of Physical Chemistry Letters
, 11(9), 3422-3429.
Orlando Fabrizio, Artiglia Luca, Yang Huanyu, Kong Xiangrui, Roy Kanak, Waldner Astrid, Chen Shuzhen, Bartels-Rausch Thorsten, Ammann Markus (2019), Disordered Adsorbed Water Layers on TiO2 Nanoparticles under Subsaturated Humidity Conditions at 235 K, in The Journal of Physical Chemistry Letters
, 10(23), 7433-7438.
Corral Arroyo Pablo, Aellig Raffael, Alpert Peter A., Volkamer Rainer, Ammann Markus (2019), Halogen activation and radical cycling initiated by imidazole-2-carboxaldehyde photochemistry, in Atmospheric Chemistry and Physics
, 19(16), 10817-10828.
Lee Ming-Tao, Orlando Fabrizio, Khabiri Morteza, Roeselová Martina, Brown Matthew A., Ammann Markus (2019), The opposing effect of butanol and butyric acid on the abundance of bromide and iodide at the aqueous solution–air interface, in Physical Chemistry Chemical Physics
, 21(16), 8418-8427.
Li Guo, Cheng Yafang, Kuhn Uwe, Xu Rongjuan, Yang Yudong, Meusel Hannah, Wang Zhibin, Ma Nan, Wu Yusheng, Li Meng, Williams Jonathan, Hoffmann Thorsten, Ammann Markus, Pöschl Ulrich, Shao Min, Su Hang (2019), Physicochemical uptake and release of volatile organic compounds by soil in coated-wall flow tube experiments with ambient air, in Atmospheric Chemistry and Physics
, 19(4), 2209-2232.
Edebeli Jacinta, Ammann Markus, Bartels-Rausch Thorsten (2019), Microphysics of the aqueous bulk counters the water activity driven rate acceleration of bromide oxidation by ozone from 289–245 K, in Environmental Science: Processes & Impacts
, 21(1), 63-73.
Ammann Markus, Bartels-RauschThorsten, ArtigliaLuca (2018), X-Ray Excited Electron Spectroscopy to Study Gas–Liquid Interfaces of Atmospheric Relevance, in Faust Jennifer A. (ed.), Elsevier, Amsterdam, 135-166.
Li Guo, Su Hang, Kuhn Uwe, Meusel Hannah, Ammann Markus, Shao Min, Pöschl Ulrich, Cheng Yafang (2018), Technical note: Influence of surface roughness and local turbulence on coated-wall flow tube experiments for gas uptake and kinetic studies, in Atmospheric Chemistry and Physics
, 18(4), 2669-2686.
Artiglia Luca, Edebeli Jacinta, Orlando Fabrizio, Chen Shuzhen, Lee Ming-Tao, Corral Arroyo Pablo, Gilgen Anina, Bartels-Rausch Thorsten, Kleibert Armin, Vazdar Mario, Andres Carignano Marcelo, Francisco Joseph S., Shepson Paul B., Gladich Ivan, Ammann Markus (2017), A surface-stabilized ozonide triggers bromide oxidation at the aqueous solution-vapour interface, in Nature Communications
, 8(1), 700-700.
Gržinić Goran, Bartels-Rausch Thorsten, Türler Andreas, Ammann Markus (2017), Efficient bulk mass accommodation and dissociation of N<sub>2</sub>O<sub>5</sub> in neutral aqueous aerosol, in Atmospheric Chemistry and Physics
, 17(10), 6493-6502.
Interfacial chemistry at the surface of airborne and ground based environmental materials such as solid or liquid aerosol particles, cloud droplets, ocean and terrestrial ground surfaces is playing a crucial role in atmospheric sciences, e.g., in the chemistry of halogen compounds, in the cycling of nitrogen oxides, in cloud droplet activation, and in ice nucleation. In this project we continue our previous laboratory based activities towards understanding important aspects of halogen activation at ocean or sea spray aerosol surfaces and of indirect photochemical nitrate reduction on mineral oxides. We will use a combination of kinetic experiments and in situ spectroscopy methods to unravel molecular level details of the processes at the corresponding interfaces. Indirect nitrate photochemistry initiated by a photosensitizer will be studied on titania and hematite as a proxy for photocatalytic materials in atmospheric mineral dust or in depolluting nanomaterial applications by means of in situ X-ray photoelectron spectroscopy (XPS) under atmospherically relevant conditions, a technique that we have built up over the past years at PSI that allows experiments to be performed at ambient relative humidity. Since these processes occur on hydroxylated oxide interfaces interacting with water vapor, the characterization of adsorbed water on mineral oxide and other solid polyfunctional organic materials is important for understanding the chemical processes. In addition, it is also relevant for heterogeneous ice nucleation, since substrates active as ice nuclei tend to structure the hydrogen bonding environment in their vicinity. We will therefore address the hydrogen bonding network of adsorbed water by measuring electron yield X-absorption spectra. Flow tube experiments will be used to study the impact of surface active organic compounds on halide oxidation by ozone at the aqueous solution - air interface. This is one of the halide oxidation reactions for which several studies have suggested surface specific reaction pathways, which are still not clarified. The hypohalides evolving from this reaction are thought to mainly react with abundant chloride or bromide to form molecular halogen compounds; potential recycling reactions, e.g., with hydrogen peroxide potentially interfering and reforming the halides will be studied in this project to assess their relevance. Furthermore, oxidation of halides initiated by photosensitizers will be studied as an important halogen activation pathway under conditions of low ozone or in absence of other radical sources. The formation of reactive intermediates in halide oxidation at the same halide solution - air interfaces will be addressed by liquid jet XPS. XPS on a liquid jet and on a droplet train will be used to characterize the surface of complex ternary solutions relevant for halogen chemistry and the activation of aerosol particles into cloud droplets, which will also serve to benchmark thermodynamic models of surface tension. Electron yield oxygen K-edge X-ray absorption spectroscopy will be used to study the hydrogen bonding environment in concentrated aqueous solutions/suspensions of ice nucleating biogenic organic macromolecules or proxies thereof to provide insight into their activity.