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Efficient sampling of ice structures by electrostatic switching.

Gerrick E Lindberg1, Feng Wang

  • 1Department of Chemistry, Boston University, Boston, MA 02215, USA.

The Journal of Physical Chemistry. B
|April 29, 2008
PubMed
Summary
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A new electrostatic switching method generates high-quality ice configurations. This technique accurately calculates the dielectric constant of ice Ih and identifies novel hydrogen-bond defects.

Area of Science:

  • Computational chemistry
  • Materials science
  • Physical chemistry

Background:

  • Accurate simulation of ice configurations is crucial for understanding its properties.
  • Previous methods for generating ice configurations have limitations, especially at low temperatures.
  • Characterizing hydrogen-bond defects in ice is essential for materials science.

Purpose of the Study:

  • To introduce a novel electrostatic switching procedure for generating high-quality ice configurations.
  • To systematically generate proton disordered ice Ih configurations using various water models and temperatures.
  • To determine the dielectric constant of ice Ih and identify novel hydrogen-bond defects.

Main Methods:

  • An electrostatic switching procedure was developed and applied.

Related Experiment Videos

  • Proton disordered ice Ih configurations were generated for TIP4P, SPC/Fw, and DC97 water models.
  • The canonical ensemble was sampled, and net dipole fluctuations were analyzed to determine the dielectric constant.

    • Main Results:

    • High-quality ice Ih configurations were systematically generated across a range of temperatures.
    • The calculated dielectric constant of ice Ih favorably compares with prior studies, exhibiting smaller error bars.
    • A new type of hydrogen-bond defect, not classifiable as D or L, was identified above 200 K.

    Conclusions:

    • The electrostatic switching procedure provides a robust method for generating accurate ice configurations.
    • The method offers improved precision in dielectric constant calculations, particularly at lower temperatures.
    • The discovery of a novel hydrogen-bond defect advances the understanding of ice physics.