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Time-of-flight modulated intensity small-angle neutron scattering measurement of the self-diffusion constant of water
Journal of Applied Crystallography  (IF3.304),  Pub Date : 2021-04-27, DOI: 10.1107/s1600576721002612
Stephen J. Kuhn, Niels Geerits, Christian Franz, Jeroen Plomp, Robert M. Dalgliesh, Steven R. Parnell

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 qt range of 0.01–0.2 Å−1 and 70–500 ps. 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 100 kHz 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.