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MM: Fachverband Metall- und Materialphysik
MM 53: Topical session: X-ray and neutron scattering in materials science II - Atomic migration studies ranging from neutrons to coherent X-rays
MM 53.3: Vortrag
Donnerstag, 3. April 2014, 12:30–12:45, BAR 205
Study of Slow Dynamic processes with Depth Resolution — •Oxana Ivanova1, Olaf Holderer1, and Michael Monkenbusch2 — 1Jülich Centre for Neutron Science, Forschungszentrum Jülich, Aussenstelle am MLZ, Garching, Germany — 2JCNS-Jülich Centre for Neutron Science, Forschungszentrum Jülich, Jülich, Germany
Neutron spin-echo (NSE) spectroscopy is a scattering technique where the spin precession of polarized neutrons in magnetic field is used to achieve the highest energy resolution for measuring tiny velocity changes of the neutron during the scattering process. Unlike the other inelastic scattering techniques, such as time-of-flight spectroscopy, NSE measures the intermediate scattering function S(Q,t) in reciprocal space and time directly. Microscopic to macroscopic time range on large and intermediate length scales are covered.
High energy resolution, low background and high stability of the Jülich Neutron Spin-Echo spectrometer (J-NSE) at Heinz Maier-Leibnitz Zentrum (MLZ) makes the instrument suitable for grazing incidence technique. Along with conventional NSE spectroscopy, which enables the measurements in bulk, grazing incidence NSE spectroscopy (GINSES) can be used as dynamic analog to GISANS in order to resolve depth dependent near surface motions. Typical applications of J-NSE include dynamics in soft matter systems (polymers in solution and under confinement, microemulsions, blends, microgels, proteins, membranes, nano-composites) or paramagnetic properties of e.g., spin glasses. Some examples of the recent experiments will be presented.