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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 6: Water on Surfaces

O 6.2: Vortrag

Montag, 1. April 2019, 10:45–11:00, H16

IR study of D2O adsorption on K-rich feldspar — •Weijia Wang1, Alexei Nefedov1, Alexei Kiselev2, Thomas Leisner2, and Christof Woell11Institute of Functional Interfaces, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 2Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany

K-rich feldspar (KAlSi3O8), a widespread component of mineral dust aerosol, plays an important role in Earth’s climate and the environmental sciences owing to its high efficiency in heterogeneous ice nucleation, therefore a fundamental understanding of water interaction with feldspar is necessary. Here we presented a systematic UHV infrared spectroscopy study of D2O adsorption on K-rich feldspar substrate starting from monolayer coverages up to thick water/ice multilayers. Two specific K-rich feldspar samples were used: orthoclase and microcline. D2O dosing on feldspar samples and IR spectra measurements were performed at low temperatures (118-150 K). IR spectra for D2O exposing to feldspar surfaces at 118 K unraveled that amorphous solid water is formed because of the limited mobility of water molecules and the more ordered ice structures can be formed on the orthoclase surfaces compared to D2O growth on the microcline surfaces. The structural transition of the unstable amorphous solid ice towards crystalline ice can be monitored as the sample is annealed. Dosing of D2O on feldspar surfaces at 150 K caused ice directly into the structure of crystalline. Annealing shows the structures of the crystalline ice are thermal stable till completed water desorption occurs.

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