scattering length density

Scattering length density (SLD) is a measure used in materials science and physics to describe how a substance scatters neutrons or X-rays. It quantifies the material’s ability to scatter these particles, depending on its atomic composition and density. Think of it as a way to describe how "bright" or "opaque" a substance appears to these probes; higher SLD means stronger scattering. SLD helps scientists analyze the internal structure of complex materials, like biological cells or layered composites, by providing a detailed contrast between different regions based on their atomic makeup.