Phys. Rev. Lett. 63, 1747–1750 (1989)Nondiffusive Brownian motion studied by diffusing-wave spectroscopyReceived 10 May 1989; published in the issue dated 16 October 1989 On a short time scale, Brownian particles undergo a transtion from the initial ballistic trajectories to diffusive motion. Hydrodynamic interactions with the surrounding fluid lead to a complex time dependence of this transition. We directly probe this transition for colloidal particles by measuring the autocorrelation function of multiply scattered, transmitted light. We show that a quantitative interpretation is possible because the transport of the light is diffusive, resolving a conflict in previous measurements. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.63.1747
DOI:
10.1103/PhysRevLett.63.1747
PACS:
82.70.Kj, 05.40.+j, 42.20.Ji
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