Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Oxides and insulators: Adsorption I
O 8.5: Vortrag
Montag, 14. März 2011, 12:15–12:30, WIL C307
Interaction of H2O and D2O with NaCl(100) — •Stephan Härtel, Jochen Vogt, and Helmut Weiss — Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg
Interactions of water with the surfaces of solids play an important role in a variety of fields such as catalysis, corrosion, and atmospheric physics. Numerous studies have been carried out so far dealing with the adsorption of water on the NaCl(100) surface. However, the structure of the water molecules on this surface is still under discussion. There are evidences for a c(4×2) superstrucure as well as a (1×1) structure [1,2].
In the present work H2O and D2O were used as adsorptives on NaCl(100). In order to study the influence of water adsorption on the surface defect concentration, the latter was probed with CO2 before and after the water experiments by means of Fourier transform infrared (FTIR) spectroscopy. The water-NaCl(100) adsorbate was prepared at crystal temperatures of 140 K. In low-energy electron diffraction (LEED) experiments the c(4×2) superstructure as well as the (1×1) structure could be observed. LEED I(V) curves in an energy range between 70 and 300 eV were recorded. First results of the LEED I(V) analysis will be presented. In additional experiments the adsorption of H2O on a CO2-precovered surface was examined. H2O replaces the CO2 quickly which indicates a growth of the H2O mainly on the terraces.
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