Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.113: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Preparation of highly polarized Xe with variable ¹²⁹Xe content — •Alexander Potzuweit, Matthias Buschmann, Richard Kastelik, Anuschka Schmitt, and Heinz Jänsch — Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg

We employ NMR of hyperpolarized ¹²⁹Xe to investigate surface phenomena. Dynamic processes at the bulk surfaces can be monitored by exchange spectroscopy (EXSY) of the bulk and surface atoms (Δ σ ≈ 100ppm). The annealing of Xe films can be investigated by line narrowing. 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. With the new, improved experimental setup we will be able to provide mixtures of highly polarized ¹²⁹Xe and ¹³²Xe with adjustable abundances. Here we present the technical development of the apparatus and discuss first results.