Time-of-flight modulated intensity small-angle neutron scattering measurement of the self-diffusion constant of water

Time-of-flight modulated intensity small-angle neutron scattering measurement of the self-diffusion constant of water

Kuhn, Stephen J. (Indiana University - Purdue University)
Geerits, Niels (Technische Universität Wien)
Franz, Christian (Technische Universität München)
Plomp, J. (TU Delft RID/TS/Instrumenten groep)
Dalgliesh, Robert M. (ISIS Facility)
Parnell, S.R. (TU Delft RID/TS/Instrumenten groep)

2021

The modulated intensity by zero effort small-angle neutron scattering (MI-SANS) technique is used to measure scattering with a high energy resolution on samples normally ill-suited for neutron resonance spin echo. The self-diffusion constant of water is measured over a q-t range of 0.01-0.2Å-1 and 70-500ps. In addition to demonstrating the methodology of using time-of-flight MI-SANS instruments to observe diffusion in liquids, the results support previous measurements on water performed with different methods. This polarized neutron technique simultaneously measures the intermediate scattering function for a wide range of time and length scales. Two radio frequency flippers were used in a spin-echo setup with a 100kHz frequency difference in order to create a high-resolution time measurement. The results are compared with self-diffusion measurements made by other techniques and the general applicability of MI-SANS at a pulsed source is assessed.

MI-SANS
modulated intensity small-angle neutron scattering
neutron scattering
neutron spin echo
self-diffusion
water

http://resolver.tudelft.nl/uuid:90916e47-3875-4f69-ac69-a8b75ef4e04e

https://doi.org/10.1107/S1600576721002612

0021-8898

Journal of Applied Crystallography, 54, 751-758

Accepted Author Manuscript

Institutional Repository

journal article

© 2021 Stephen J. Kuhn, Niels Geerits, Christian Franz, J. Plomp, Robert M. Dalgliesh, S.R. Parnell