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A modified TIP3P water potential for simulation with Ewald summation.

Daniel J Price1, Charles L Brooks

  • 1Department of Molecular Biology (TPC-6), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

The Journal of Chemical Physics
|November 20, 2004
PubMed
Summary

Modified TIP3P water potential parameters improve molecular dynamics simulations using Ewald summation. This enhanced model accurately predicts density, heat of vaporization, and diffusion coefficients for water.

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics Simulations
  • Physical Chemistry

Background:

  • Standard TIP3P water potential has limitations with Ewald summation in molecular dynamics.
  • Optimizing nonbonded parameters is crucial for accurate simulation results.

Purpose of the Study:

  • To reparametrize the TIP3P water model for improved performance with Ewald summation.
  • To enhance the accuracy of molecular dynamics simulations for water properties.

Main Methods:

  • Modified charges and Lennard-Jones parameters for TIP3P water potential.
  • Optimized parameters excluding Lennard-Jones interactions for hydrogen atoms.
  • Evaluated performance using density, heat of vaporization, radial distribution functions, dielectric constant, and diffusion coefficient.

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Main Results:

  • Achieved accurate density (0.997 g/ml) and heat of vaporization (10.53 kcal/mol).
  • Improved radial distribution function, dielectric constant (89), and diffusion coefficient (4.0 x 10^-5 cm²/s).
  • Model did not exhibit a temperature density maximum; other models showed limitations in hydration free energy calculations.

Conclusions:

  • The modified TIP3P model offers superior accuracy for molecular dynamics simulations of water with Ewald summation.
  • Further refinements, including long-range corrections, can improve specific properties like the dielectric constant.
  • The study highlights the importance of parameter optimization for specific simulation conditions.