Brownian motion from molecular dynamics

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Brownian motion of single particles with various masses M and diameters D is studied by molecular dynamics simulations. Besides the momentum auto-correlation function of the Brownian particle the memory function and the fluctuating force which enter the generalized Langevin equation of the Brownian particle are determined and their dependence on mass and diameter are investigated for two different fluid densities. Deviations of the fluctuating force distribution from a Gaussian form are observed for small particle diameters. For heavy particles the deviations of the fluctuating force from the total force acting on the Brownian particle decrease linearly with the mass ratio m/M where m denotes the mass of a fluid particle. (C) 2010 Elsevier B. V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2010-10
Language
English
Article Type
Article
Keywords

STOCHASTIC-PROCESSES; TIME-EVOLUTION; TRANSPORT; MOTORS; MICRODYNAMICS; EQUILIBRIUM; PHYSICS

Citation

CHEMICAL PHYSICS, v.375, no.2-3, pp.316 - 326

ISSN
0301-0104
DOI
10.1016/j.chemphys.2010.05.019
URI
http://hdl.handle.net/10203/94913
Appears in Collection
CH-Journal Papers(저널논문)
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