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Normalization of stroboscopic neutron scattering experiments
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. (Materialfysik)ORCID iD: 0000-0002-5748-2237
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Neutron scattering studies of kinetic processes are often ux limited. For processes,which can be repeated many times, this can be mitigated by the so-called strobo-scopic reintegration. The recorded scattering signals are assigned to dierent timeslices of the process and corresponding slices from all repetitions are summed up. Thenormalisation of such data with respect to the incident beam spectrum can be chal-lenging since the incident neutron ux may not necessarily be evenly distributed overall time slices. In this paper we discuss how this can result in misleading informationand a technique to amend for these issues is presented.

National Category
Condensed Matter Physics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-348265OAI: oai:DiVA.org:uu-348265DiVA, id: diva2:1196982
Available from: 2018-04-11 Created: 2018-04-11 Last updated: 2018-04-13Bibliographically approved
In thesis
1. Opportunities and challenges of surface scattering at next generation neutron sources
Open this publication in new window or tab >>Opportunities and challenges of surface scattering at next generation neutron sources
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Complex fluids and soft matter are ubiquitously found in the world and all contacts in life are made over surfaces. To describe the mechanical behavior of such substances, rheological methods are used. Flow instabilities are a big challenge in rheology since they will be reflected in the macroscopic variables probed, like e. g. the viscosity. Many such discontinuities may actually originate at the surface. Investigating the properties of liquids in contact with the surface under mechanical load is the main course of the thesis. Neutron reflectometry and GISANS are perfect tools in this context to access the solid liquid interfaces, since they can penetrate many engineering materials and show a comparably large scattering potential at deuterated samples. In this thesis shear was applied on a model solution and neutron scattering techniques were used to investigate the structure under load. The focus was set on the development of the measurement methods themselves to enable new scientific insights in the future. First, by stroboscopic measurements the flux limitations are overcome for oscillatory rheology. By reintegration in the post processing it is shown that kinetic measurements with neutrons are possible with a time resolution below one millisecond. Second, the transformation of grazing incidence data from the laboratory system into q-space is strongly non-linear resulting in a need for re-binning. In this thesis a universal tool has been developed for this purpose. Finally, there is an ongoing discussion on depth sensitive neutron scattering experiments from solid-liquid boundaries. By using emission densities we show that such experiments face severe limitations due to the low absorption cross section of the neutron.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 51
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1666
Keywords
GISANS, data reduction, off-specular, neutron scattering, reflectometry, complex fluids, rheology
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-348348 (URN)978-91-513-0324-6 (ISBN)
Public defence
2018-05-25, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:30 (English)
Opponent
Available from: 2018-05-08 Created: 2018-04-11 Last updated: 2018-10-08

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Adlmann, FranzWolff, Max

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