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 35.129: Poster

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

Preparation and application of highly polarized Xe with variable ¹²⁹Xe content — •Alexander Potzuweit, Richard Kastelik, Hagen Allmrodt, Lars Kraft, Anuschka Schaffner, and Heinz Jänsch — Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg

We employ NMR of hyperpolarized ¹²⁹Xe to investigate surface phenomena and diffusion. To increase the sensitivity towards structurally caused, local inhomogeneities a small line width is favorable. In solid Xe the line width is dominated by dipolar interaction with neighboring nuclear spins. This can be substantially reduced by diluting the NMR-active isotope ¹²⁹Xe in the NMR-inactive isotope ¹³²Xe. Thus we are able to investigate ordering effects like annealing. Dynamic processes at the bulk surfaces can be monitored by exchange spectroscopy (EXSY) of the bulk and surface atoms (Δν ≈ 100 ppm). Here we present the technical development of the apparatus and discuss first results.