# Dynamic Light Scattering

In the Dynamic Light Scattering experiment, how is the intensity distribution plotted against time, keeping in view the multiple scattering of photon particles in laser ?

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Can you clarify your question? Industrial particle size measuring kit requires you to use low particle densities so multiple scattering is minimal. Are you asking how you can analyse the scattering for higher densities where multiple scattering is significant? – John Rennie Jun 2 '12 at 8:15
yes please. What is the difference between both the processes,i.e. in single scattering and multiple scattering ? Also please clarify that in single scattering if a photon scattered by a particle in the solution gets scattered again due to another particle in its way how is this going to affect the distribution ? – stp30 Jun 4 '12 at 4:25

Typically what's plotted in dynamic light scattering is the magnitude of the autocorrelation of the scattering on the y-axis, and the decay time $\tau$ on the x-axis. $\tau$ is a parameter used in the definition of the autocorrelation function. The autocorrelation function is a precise definition of how correlated the scattering signal at time $t$ is with the scattering signal at time $t+\tau$. The autocorrelation varies with $\tau$, so it is plotted against $\tau$