2. Reflectometry. Surface profiles
A neutron beam is reflected by a surface at grazing incidence (figure 19 ). Reflection is total as long as the angle remains below a critical angle, characteristic of the surface.
When the angle of incidence is greater than the critical angle, only a fraction of the neutrons are reflected. The curve of reflected intensity as a function of angle of incidence (Figure
20
) provides unambiguous information on compositions, thicknesses and roughness (or inter-layer interdiffusion distances)
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Reflectometry. Surface profiles
Small-angle diffusion
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