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![[Figure 1]](uq5006fig1mag.jpg)
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Figure 1
Schematic depiction of the different SANS geometries. (a) Transmission SANS geometry where the neutron beam is oriented normal to the sample surface A located in the xy plane. The edge thickness t of the sample is positioned parallel to the incident neutron beam, which propagates along the z axis of the sample. (b) Reflection SANS geometry where the neutron beam is directed at a shallow incidence angle αi with respect to the sample surface A located in the xy plane. The edge thickness t of the sample is positioned (almost) perpendicular to the incident neutron beam, which propagates along the x axis of the sample. For values of αi greater than or equal to the material-specific critical angle of reflection αc, the configuration is known as near-surface SANS. For values of αi less than αc an evanescent wave may form in the surface layers of the sample. This configuration is referred to as grazing-incidence SANS. For each geometry, rocking scans are obtained by rotating the sample about the vertical ω and horizontal ϕ instrument axes. |
![[Figure 1]](uq5006fig1.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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