Abstract
To investigate long length scale structures using neutron scattering, real space techniques have shown certain advantages over the conventional methods working in reciprocal space. As one of the real space measurement techniques, spin echo modulated small angle neutron scattering (SEMSANS) has attracted attention, due to its relaxed constraints on sample environment and the possibility to combine SEMSANS and a conventional small angle neutron scattering instrument. In this report, we present the first implementation of SEMSANS at a pulsed neutron source and discuss important corrections to the data due to the sample absorption. These corrections allow measurements made with different neutron wavelengths and SEMSANS configurations to be overlaid and give confidence that the measurements provide an accurate representation of the density correlations in the sample.
Highlights
Small angle scattering (SAS), using either X-ray or neutrons, has made important measurements of the structures of many materials including polymers[1], magnetic materials[2] and biological materials[3], addressing length scales from 1 nm to several hundreds of nm
We have discussed the feasibility of correcting the spin echo modulated small angle neutron scattering (SEMSANS) data to remove the contribution from the difference of the absorption efficiency between the sample and blank
The data correction is especially critical for TOF SEMSANS due to the wavelength dependence of the absorption efficiency
Summary
When scattering occurs within the sample, the trajectory after the sample will deviate from its initial path such that the field integral cannot be balanced any more and a net polarization change will be measured. SESANS is a 1-D real space technique and it provides a one to one relation between the density correlation function of the sample and the neutron polarization observed after Larmor labeling. As shown by Rekveldt[23], both SESANS and SEMSANS will directly yield the pair correlation function even for strongly scattering samples with significant multiple scattering. This makes them extremely useful for systems with strong scattering to measure inter-particle correlations. This is different from that of SANS, which is typically used for dilute systems for form factor measurements
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