Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

In situ light scattering techniques at neutron instruments at the MLZ - experiences made and challenges ahead

Dec 9, 2020, 2:30 PM
3h 30m
Online event

Online event

Poster DN: Life Science/ Biology Joint poster session of MLZ User Meeting and DN2020

Speaker

Dr Tobias E. Schrader (Juelich Centre for Neutron Science (JCNS))

Description

What is well established at many synchrotron beam lines is still in the development phase at neutron instruments: in situ light scattering techniques for on-beam sample control. Biological samples often show a sufficiently broad spectral range where light absorption does not play a dominant role. This enables in situ sample control using dynamic and static light scattering techniques. Many biological samples undergo a slow aggregation process during the comparatively long neutron data collection times. If the aggregates are staying few in number and/or if their form factor has decayed enough in the relevant q-range, the neutron measurement can be continued. If not, a fresh sample can be used.
Candidates for neutron instruments to be equipped with an in situ light scattering set-up are small angle scattering, spin echo, time-of-flight and backscattering instruments operating sample environments near or at room temperature. We routinely provide in situ dynamic light scattering with one fixed scattering angle at the instrument KWS-2 at MLZ to interested users. For the Jülich spin echo spectrometer J-NSE we have developed a temperature-controlled sample environment which includes two laser colours and three light scattering angles. This not only enables dynamic light scattering but also static light scattering at six different q-values is feasible.
This contribution discusses the experiences made with these in situ set-ups and looks into future developments and improvements.

Primary author

Dr Tobias E. Schrader (Juelich Centre for Neutron Science (JCNS))

Co-authors

Livia Balacescu (RWTH Aachen) Mr Florian Vögl (Technische Universität München) Olaf Holderer Aurel Radulescu (Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ) Mr Simon Staringer (Jülich Centre for Neutron Science (JCNS)) Georg Brandl

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