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O: Fachverband Oberflächenphysik

O 73: Organic Molecules on Inorganic Substrates V: Adsorption, Growth and Networks

O 73.3: Hauptvortrag

Mittwoch, 18. März 2020, 15:30–16:00, TRE Phy

1.*Real-space investigation of the influence of polar species on ice structure — •Karina Morgenstern — Physikalische Chemie I, Ruhr-Universität Bochum, Germany

The interaction of water with solid surfaces is crucial in several scientific disciplines as diverse as environmental science, solvation science, biophysics, and astrochemistry. In these disciplines, there are several major water ice-related challenges that require a molecular-level understanding and description of water. In particular atmospheric chemistry, where most reactions in the atmosphere proceed on ice-covered nanoparticles poses a large variety of unanswered questions with respect to ice surfaces. Thereby, natural water was and is never as pure as distilled water, but contains air, salts, dust, organics, bacteria and so forth. Appropriate answers of relevance to real systems thus require a fundamental understanding of the structure of ice, not only in its purest, but in particular in its more realistic contaminated state. We explore how contaminants, in particular organic molecules and cations, alter the structure of ices on the (111) faces of the coin metals using low-temperature scanning tunneling microscopy. The systems discussed in this talk are azobenzene [1,2] and carbene [3] as prototypes for polar molecules and lithium and cesium ions as prototypes for cations. Moreover, we will present an example, how the structure of ice influences the reactivity of a photo-induced reaction [4].

[1] J. Am. Chem. Soc. 136, 13341 (2014); [2] Angew. Chem. Int. Ed. 57, 1266-1270 (2018); [3] Angew. Chem. Int. Ed. 57, 16334-16338 (2018); [4] Phys. Rev. Lett. 121, 206001 (2018)