Dresden 2014 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 4: Anomalous Diffusion

DY 4.7: Vortrag

Montag, 31. März 2014, 11:00–11:15, ZEU 146

Spin diffusion in a ¹²⁹Xe crystal on mesoscopic length scales — •Alexander Potzuweit, Hagen Allmrodt, Lars Kraft, Anuschka Schaffner, and Heinz Jänsch — Fachbereich Physik, Philipps-Universität Marburg, D-35032 Marburg

Medical applications using hyperpolarized ¹²⁹Xe have attracted much attention over the past years. To improve production and storage of hyperpolarized xenon further, a deeper understanding of the relaxation and transport processes is necessary. We employ NMR to investigate relaxation and spin diffusion in Xe films on mesoscopic length scales (nm… µm). Inside the NMR-spectrometer the hyperpolarized ¹²⁹Xe is frozen onto a Cu single crystal. At the xenon/metal interface the xenon will depolarize, so the copper serves as a polarization drain attached to one side of the xenon crystal. Using a simple diffusion model we analyze the experimental results like the spin transport to this drain as a function of time. By diluting the NMR-active isotope ¹²⁹Xe in the NMR-inactive isotope ¹³²Xe it is even possible to fine tune the diffusion constant or to inhibit spin diffusion altogether.