Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Functional Materials - Hydrogen
MM 14.9: Vortrag
Montag, 11. März 2013, 17:45–18:00, H26
Quantitative 3D Microscopy of Hydrogen by Proton-Proton Scattering — •Marcus Moser1, Stefan Wagner2, Katrin Peeper1, Patrick Reichart1, Astrid Pundt2 und Günther Dollinger1 — 1Universität der Bundeswehr München, 85579 Neubiberg, Germany — 2Institut für Materialphysik, Universität Göttingen, Göttingen 37077, Germany
Proton-proton scattering at the Munich microprobe SNAKE gives the unique possibility for sensitive 3D hydrogen microscopy [1]. Quantification of the hydrogen content without the need of any reference sample, a sensitivity of few or even less than one atomic part per million, a lateral resolution of about 1 *m and a depth resolution of a few micrometers are the main characteristics. We use proton energies between 10 MeV and 25 MeV for analyzing any kind of unsupported samples with thickness between 10 um and 250 um depending on the atomic density of the investigated material. With this method, we measured hydrogen in thin Nb-films. The Nb- films with a thickness of 700nm are electrochemically doped with hydrogen. We have been able to detect and quantify lateral hydrogen distributions and variations induced by hydrogen charging. Hydrogen within the crystallites was measured to be below 0.08 at-ppm.
References [1] P. Reichart, et al., Science 306 (2004) 1537.