Depolarized dynamic light scattering (DDLS) experiments are reported on three different systems:  on tobacco mosaic virus as a well investigated sample; on PEO−PPO−PEO triblock copolymer micelles, which show sphere-to-rod transition with increasing temperature; and on a microemulsion of the type water/octane/C i E j . DDLS measurements were performed using highly discriminating polarizers and single-mode fiber detection at different scattering angles, obtaining decay rates Γ VH versus scattering angle. The rotational and translational diffusion coefficients available from these plots were taken to evaluate size parameters of the systems using Broersma's expressions for a stiff rod. Good agreement with theory and literature was found in the case of tobacco mosaic virus and at concentrations below the overlap concentration c* for the other two systems.

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