Quasielastic-light-scattering measurements were made on microemulsions in which the apparent volume fraction $\phi$ of the microemulsion droplets was varied from 0.1 to 0.75. The density correlation function shows an exponential decay at short time but deviates from it at long time especially for intermediate $\phi$. The initial decay rates of the correlation functions decrease steadily as a function of $\phi$, reaching a minimum at ${\phi }_c=0.62\mathrm{}$, and increase thereafter. The overall time dependence of the correlation functions can be fitted by the function $\exp [-{\left(\frac{t}{T}\right)}^{\alpha }]$; the exponent $\alpha$ varies from 1 down to 0.66 and back up again to 0.9 over the range of $\phi$.

• Received 8 July 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.1888