Direct Observation of Nondiffusive Motion of a Brownian Particle

B. Lukic; S. Jeney; C. Tischer; A. J. Kulik; L. Forro; E.-L. Florin

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Direct Observation of Nondiffusive Motion of a Brownian Particle

机译：直接观察布朗粒子的非扩散运动

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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.

机译：通过具有纳米空间和微秒时间分辨率的光阱干涉法记录浸没在流体中的单个微米大小的球的热位置波动。根据包括流体动力记忆效应在内的布朗运动理论，我们发现，从弹道运动到扩散运动的过渡被延迟了比标准兰格文方程所预测的更长的时间。该延迟是流体惯性的结果。在研究的最短时间尺度上，球的惯性影响很小，但可测量。

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来源
《Physical review letters》 |2005年第16期|p.160601.1-160601.4|共4页
作者
B. Lukic; S. Jeney; C. Tischer; A. J. Kulik; L. Forro; E.-L. Florin;
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作者单位

Institut de Physique de la Matiere Complexe, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

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原文格式 PDF
正文语种 eng
中图分类物理学;
关键词
brownian motion; optical trapping;

机译：布朗运动;光学陷阱;

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Direct Observation of Nondiffusive Motion of a Brownian Particle

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