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At low particle concentrations number fluctuations in photon-correlation spectroscopy measurements lead to a slow decay in the autocorrelation function, which contains information about the concentration. The characteristic time tau(c) of this number-fluctuation decay depends on the size of both the particle and the scattering volume. For determination of the concentration a measurement should last for at least a time of 100tau(c). Using Brownian dynamics simulations and measurements, we have studied the effects of the measurement time on the decay of the number fluctuations.

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