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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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O: Fachverband Oberflächenphysik

O 20: Oxides II: Structures, Interactions and Reducibility

O 20.1: Talk

Monday, March 16, 2020, 15:30–15:45, WIL B321

From UHV to ambient conditions: Water on In2O3(111)Hao Chen1,2, Matthias A. Blatnik1, Francesca Mirabella1, Giada Franceschi1, Michele Riva1, Michael Schmid1, Jan Čechal3, Bernd Meyer4, Ulrike Diebold1, and •Margareta Wagner1,31Inst. of Applied Physics, TU Wien, Wien, Austria — 2State Key Laboratory of Catalysis, CAS, iChEM, Dalian Inst. of Chem. Phys., Chin. Acad. of Science, Dalian, China — 3CEITEC, Brno University of Technology, Brno, Czech Republic — 4ICMM/CCC FAU Erlangen-Nürnberg, Erlangen, Germany

We study the interaction of water with the In2O3(111) surface, employing surface science techniques (TPD, XPS, non-contact AFM and STM as well as DFT calculations). The adsorption is investigated as a function of coverage, i.e., from single water molecules to multilayers, in UHV, at pressures present in the ambient and as a liquid. The saturation coverage at 300 K in UHV is three dissociated molecules per unit cell, visible as propeller-shaped bright protrusions in STM. Their internal structure is revealed by nc-AFM, showing in total six objects: 3 OH groups sharing a surface oxygen and 3 residual hydroxyl groups; TPD shows 3 desorption peaks above 300 K resulting from different desorption barriers for the recombining water molecules. After the interaction with liquid water also molecular water species are found on In2O3 (111).

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