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Multispeckle ensemble-averaged intensity–intensity autocorrelation functions [g 2(q, t)] from a dilute colloidal suspension of silica particles with a mean radius of 300 nm. Continuous lines are exponential fits with relaxation rate Γ(q). The inset depicts the D 0 q 2 behaviour of Γ(q) with D 0 ≃ 0.83 µm2 s−1.
