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Journal of Chemical Physics / Volume 113 / Issue 15 / ARTICLES / Condensed Phase Dynamics, Structure, and Thermodynamics: Spectroscopy, Reactions, and Relaxation

J. Chem. Phys. 113, 6264 (2000); doi:10.1063/1.1308542 (12 pages)

Coarse graining of nonbonded inter-particle potentials using automatic simplex optimization to fit structural properties

Hendrik Meyer, Oliver Biermann, Roland Faller, Dirk Reith, and Florian Müller-Plathe

Max-Planck-Institut für Polymerforschung, 55021 Mainz, Germany

(Received 26 May 2000; accepted 20 July 2000)

We implemented a coarse-graining procedure to construct mesoscopic models of complex molecules. The final aim is to obtain better results on properties depending on slow modes of the molecules. Therefore the number of particles considered in molecular dynamics simulations is reduced while conserving as many properties of the original substance as possible. We address the problem of finding nonbonded interaction parameters which reproduce structural properties from experiment or atomistic simulations. The approach consists of optimizing automatically nonbonded parameters using the simplex algorithm to fit structural properties like the radial distribution function as target functions. Moreover, any mix of structural and thermodynamic properties can be included in the target function. Different spherically symmetric inter-particle potentials are discussed. Besides demonstrating the method for Lennard-Jones liquids, it is applied to several more complex molecular liquids such as diphenyl carbonate, tetrahydrofurane, and monomers of poly(isoprene). © 2000 American Institute of Physics.

© 2000 American Institute of Physics

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KEYWORDS and PACS

Keywords

mesoscopic systems, optimisation, thermodynamic properties, molecular dynamics method, digital simulation, potential energy surfaces

PACS

  • 73.23.-b

    Electronic transport in mesoscopic systems

  • 61.20.Ja

    Computer simulation of liquid structure

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.1308542

PUBLICATION DATA

ISSN:

0021-9606 (print)  
1089-7690 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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