Dresden 2003 – scientific programme
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.12: Poster
Thursday, March 27, 2003, 15:30–18:00, P1
Transport of colloidal particles in strong light fields — •Christoph Lutz1, Markus Kollmann2, and Clemens Bechinger1 — 1Fachbereich Physik, Universitaet Konstanz, 78457 — 2Observatory of complex Systems, University of Palermo, 90141 Palermo
Single-file diffusion (SFD), prevalent in many chemical and biological processes, refers to the one-dimensional motion of interacting particles in pores which are that narrow that the mutual passage of particles is excluded. Since the sequence of particles in such a situation remains unaffected over time t, this leads to strong deviations from normal diffusion, e.g. an increase of the particle mean-square-displacement as the square root of t. We present experimental results of the diffusive behavior of colloidal particles in one-dimensional channels with varying particle density. The channels are realized by means of a scanning optical tweezer. Based on a new analytical approach for SFD, we can predict the longtime, collective diffusive behavior from the short time density fluctuations in our systems.