Brownian morion

P. Ullersma, An exactly solvable model for Brownian morion. Physica 32,27,56,74,90 (1966). 

Unis, SANS yields S(Q, 0), which corresponds to the average of instantaneous stractures, whereas NSE spectroscopy yields additional information on the temporal variation of the stmc-tures that contribute to the scattering intensity. The motions observed are thermal flucmations, their correlation time depends on a balance of friction, and eventually present forces restoring equilibrium configurations. If no restoring forces act, the observed Brownian morion is diflusion without bounds, if microscopic confinement by external potentials or topological effects is present, the diffusion is bounded and the correlation function halts at a finite level. 

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See also in sourсe #XX -- [ ]

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