Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.131: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Towards NMR of buried interfaces — •Anuschka Schaffner, Hagen Allmrodt, Lars Kraft, Richard Kastelik, Alexander Potzuweit, and Heinz Jänsch — Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg

We employ Xe-NMR to investigate surface phenomena by adsorbing hyperpolarized ¹²⁹Xe onto a helium-cooled single crystal and studying the electronic interactions of substrate and adsorbate. The high nuclear spin polarization of the adsorbed Xe-film could be transferred to buried interfaces within the substrate (which then would be accessible for further NMR experiments) via dipolar near distant-field transfer. The proposed distant-field transfer [1] will be discussed. As a test of the here proposed polarization transfer, we use a system of an absorbed hyperpolarized ¹²⁹Xe-film beneath a layer of unpolarized ¹²⁹Xe in a matrix of CO₂, geometrically and spectrally separated. Here, we present the experiments and discuss the transfer mechanism.
[1] Desvaux et al. Eur. Phys. J. Appl. Phys. Vol. 36, No. 1, 2006