Grazing-incidence small-angle neutron scattering from structures below an interface

Nouhi, S.; Hellsing, M.S.; Kapaklis, V.; Rennie, A.R.

doi:10.1107/S1600576717007518

Journal of Applied Crystallography Journal of Applied
Crystallography

IUCr IT WDC

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Figure 2
Detector image recorded for PS11 latex in D₂O at $[\theta_{\rm i}/\theta_{\rm c} = 1.4]$ , indicating scattering regions (NG3 SANS, NIST). The critical angle for this sample, measured with λ = 0.8 nm, was 0.7°. Streaking of the scattering around the labelled Bragg peaks shows the effect of instrument resolution. This effect is more pronounced with NG3 SANS than D22 owing to the slightly larger wavelength spread and better pixel resolution. The region around the transmitted beam shows the refraction and the scattered signal with clear diffraction peaks from a highly ordered sample structure, but these are subject to heavy multiple scattering. There is also strong diffuse background scattering from the sample cell and sealing ring in this region. In general, describing Q is complicated because of both refraction effects and the different origins of the scattering. The axes are labelled simply according to equations (6)