# Dynamic Light Scattering

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

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

## References

1. Dynamic Light Scattering Edited by Robert Pecora 1985. Plenum Press New York
2. Foundations of Colloid Science Written by Robert J. Hunter 1987 Clarendon Press Oxford
3. J.W Goodman, Some Fundamental Properties of Speckle, JOSA, Vol. 66, Issue 11, pp. 1145-1150 (1976)