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Dynamic structure factor

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In condensed matter physics, the dynamic structure factor is a mathematical function that contains information about inter-particle correlations and their time evolution. Experimentally, it can be accessed most directly by inelastic neutron scattering.

The dynamic structure factor is most often denoted S(q,ω), where q (also k) is a wave vector (a wave number for isotropic materials), and ω a frequency (sometimes stated as energy, ). It is the spatial and temporal Fourier transform of van Hove's time-dependent pair correlation function G(r,t), whose Fourier transform with respect to r, F(Q,t), is called the intermediate scattering function and can be measured by neutron spin echo spectroscopy.[1] In an isotropic sample (with scalar r), G(r,t) is a time dependent radial distribution function.

References

  1. ^ Hansen, J.P.; McDonald, I.R. (1986). Theory of Simple Liquids. Academic Press.

Further reading