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Dynamic Light Scattering

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    334

    • specklePattern.jpg
    Figure 2. Exponential decay of the correlation function.

    The correlation function for a system experiencing Brownian motion \(G(t)\) decays exponentially with decay constant \(\Gamma\).

    \[G(t)=e^{-\Gamma t}\]

    \(\Gamma\) is related to the diffusivity of the particle by

    \[\Gamma=-Dq^{^{2}} \]

    where

    \[q=\frac{4\pi n }{\lambda}\sin(\dfrac{\Theta }{2})\]

    Contributors and Attributions

    • Ben Nail (University of California Davis Chemistry Department)