Thu, 21 Aug 2008 05:30:27 BST CiteULike: nnny's Lukic http://www.citeulike.org/user/nnny/author/Lukic CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/nnny/article/1378517 <i>Physical Review Letters, Vol. 95, No. 16. (2005)</i><br /><br />The thermal position fluctuations of a single micron-sized sphere immersed in a fluid were recorded by optical trapping interferometry with nanometer spatial and microsecond temporal resolution. We find, in accord with the theory of Brownian motion including hydrodynamic memory effects, that the transition from ballistic to diffusive motion is delayed to significantly longer times than predicted by the standard Langevin equation. This delay is a consequence of the inertia of the fluid. On the shortest time scales investigated, the sphere's inertia has a small, but measurable, effect. Direct Observation of Nondiffusive Motion of a Brownian Particle B Lukic S Jeney C Tischer AJ Kulik L Forro EL Florin doi:10.1103/PhysRevLett.95.160601 Physical Review Letters, Vol. 95, No. 16. (2005) 2007-06-11T11:57:16-00:00 2005 Physical Review Letters 95 16 APS brownian_particle hydrodynamic_interaction