Fig. 5: Schematic diagrams of the experimental cell and how it relates to the scattering geometry used for the study.
From: Density profile of 3He in a nanoscale 3He-4He superfluid film determined by neutron scattering
a The position of the silicon block’s surface in relation to the incoming and reflected neutron beams. b The scattering geometry for neutron reflection. ki,f are the neutron incident and final wavevector respectively. Qz = kf − ki is the wavevector transfer parallel to the surface normal. For off-specular scattering Qx, the wavevector component in the plane of the sample is non-zero and information on in-plane correlations can be accessed.
