Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.96: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Surface sturcutre of inorganic salt solutions — •Tobias Hammer, Manuela Reichelt, and Harald Morgner — Universität Leipzig, Wilhelm Ostwald Institut

The aim of our research is the investigation of the molecular structure and composition of liquid surfaces and surface near range with spectroscopic methods and, furthermore, the correlation of this information with macroscopic properties of solutions (e.g. surface tension, density). One of our most powerful techniques is Neutral Impact Collision Ion Scattering Spectroscopy (NICISS) that makes use of the energy loss of Helium projectiles being backscattered from soft matter targets. With this tool it is possible to determine elemental depth profiles and the surface structure of liquid surfaces. The spectroscopic methods used here are vacuum based techniques. Up until now, this fact has limited the choice of usable solvents to those with low vapor. At present we are about to develop the experimental set up in order to investigate volatile liquids like water. The actual state of our equipment does allow to study aqueous solutions for high salt concentrations at low temperature, while the parts needed for handling low concentrations at ambient temperatures is still under construction. For the time being, we have carried out measurements on the influence of the ion radii of the cation or the anion to the surface structure, with alternative solvents including glycerol.