Regensburg 2010 – wissenschaftliches Programm

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SYMR: Symposium Nuclear Magnetic Resonance: from Applications in Condensed-Matter Physics to New Frontiers

SYMR 2: Poster: Nuclear Magnetic Resonance - Frontiers and Applications

SYMR 2.11: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

A spatially resolved mechanical field cycling relaxometer — •Michael Ditter1, Holger Stork1,3, Achim Gädke1,4, Franz Fujara1, Beatrice Schuster1,2, Christina Trautmann2, and Reinhard Neuman21Institut für Festkörperphysik, TU Darmstadt, Hochschulstr. 6, Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3National des Champs Magnétiques Intenses, r. d. Martyrs, Grenoble — 4School of Engineering and Computer Science, Victoria University, Kelburn Parade, Wellington

Recently a new method for the spatially resolved characterization of heavy ion irradiated crystals using static field gradient NMR was developed [1]. With this method it is possible to measure one-dimensional spin-lattice relaxation rate profiles with a spatial resolution in the order of 10 µm. In the meantime the spectrometer has been further improved and the method expanded to conduct frequency and temperature dependent measurements. For field cycling NMR the probe is moved inside the stray field of a superconducting magnet. Due to the strong magnetic field gradient only the nuclei within a thin excited slice are in resonance, allowing spatial resolution. It is possible to utilize fields between 6.3 and 0.008 T. The positioning system is capable of achieving switching times of less than 5 s. The accessible sample temperature ranges from RT to 500 K. The relaxometer will be used for spatially resolved spin-lattice relaxation dispersion experiments of swift heavy ion irradiated ionic crystals.

[1] Stork H, Hamburger A, Gädke A, Fujara F and Schwartz K 2008 J. Phys.: Condens. Matter 20 275236

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