Grazing incidence neutron spin echo spectroscopy: instrumentation aspects and scientific opportunities

International Workshop on Neutron Optics and Detectors

Holderer, O.^1 ; Frielinghaus, H.^1 ; Wellert, S.^2 ; Lipfert, F.^1 ; Monkenbusch, M.^3 ; Von Klitzing, R.^2 ; Richter, D.^1,3

Jülich Centre for Neutron Science (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Julich, Lichtenbergstr. 1, 85747 Garching, Germany^1

Institut für Chemie, Technische Universität Berlin, Berlin, Germany^2

Jülich Centre for Neutron Science (JCNS), Institute for Complex Systems, Forschungszentrum Julich, D-52425 Jülich, Germany^3

关键词: Collimated beams;    Conceptual questions;    Experimental techniques;    Grazing incidence;    Low-intensity;    Neutron spin echo;    Neutron spin echo spectroscopies;    Thermally driven;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012025/pdf
DOI  :  10.1088/1742-6596/528/1/012025

来源: IOP

【 摘 要 】

Grazing Incidence Neutron Spin Echo Spectroscopy (GINSES) opens new possibilities for observing the thermally driven dynamics of macromolecules close to a rigid interface. The information about the dynamics can be retrieved as a function of scattering depth of the evanescent neutron wave, on the length scale in the range of some 10-100 nm. Using a classical neutron spin echo spectrometer with a laterally collimated beam, dynamics can be measured in grazing incidence geometry. We show examples of how the interface modifies the dynamics of microemulsions, membranes and microgels. Instrumental details and possible improvements for this technique will be presented. The key issue is the low intensity for dynamics measurements with an evanescent neutron wave. Conceptual questions how a specialised instrument could improve the experimental technique will be discussed.