Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session III (Methods: Atomic and electronic structure; Methods: electronic structure theory; Methods: Molecular simulations and statistical mechanics; Methods: Sanning probe techniques; Methods: other (experimental); Methods: other (theory) )

O 60.33: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B2

Diffusion of Xe on Multilayer Xe — •Anuschka Schmitt, Matthias Buschmann, Thomas M. Ernst, and Heinz J. Jänsch — Philipps-Universität Marburg

Diffusion of Xe on Xe-multilayers or inside the multilayers is largely unexplored. This mainly reflects a lack of methods. We employ NMR of ¹²⁹Xe to investigate surface phenomena. The sensitivity is greatly enhanced by the use of laser-polarized ¹²⁹Xe.

Here we explore different NMR-techniques to study diffusion: surface layer to second layer exchange could be monitored through the strong chemical shift difference (Δ σ≈ 100 ppm) of the two; disorder in the solid is spectrally seen by broad lines due to chemical shift fluctuations, so that annealing is detected by line narrowing; direct diffusional motion is measured in pulsed magnetic field gradients.

UHV-compatible gradient coil design was tested and a proof of principle demonstrated by sodium diffusion in a NaCl aqueous solution.