Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: New Instruments and Methods

CPP 8.3: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Characterization of heavy ion induced defects in ionic crystals by magnetic resonance techniques — •Michael Ditter, Kai-Christian Meyer, Sebastian Orth, and Franz Fujara — Institut für Festkörperphysik, TU Darmstadt, 64289 Darmstadt

We explore the potential and limitations of nuclear magnetic resonance (NMR) as a tool for the examination of heavy ion induced radiation damage in materials. We choose various fluoride crystals as guinea pig systems, here focusing at lithium fluoride (LiF). LiF offers two suitable probe nuclei for NMR, further on paramagnetic defects, such as F-centers, and metallic colloids can be observed directly by electron spin resonance (ESR). Extensive research has been carried out in the past but has also lead to new unanswered questions. NMR relaxometry with one dimensional spatial resolution is used to study defect generation and annealing behavior as well as impurity cluster formation along and beyond the ion path. Data from conventional and spatially resolved NMR field-cycling experiments, the latter with a purposely built spectrometer [1], can be utilized to determine defect distribution. NMR spectroscopy is used to observe fluorine gas bubbles formed during irradiation. Additionally CW ESR allows us to measure the density of paramagnetic defects as well as the formation of higher F-center aggregates, lithium and impurity colloids during annealing experiments. The latest results will be presented.

[1] M. Ditter, H. Stork, B. Schuster, F. Fujara: Journal of Magnetic Resonance 209 (2011) 47-52