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High-density amorphous ice: a path-integral simulation.

Carlos P Herrero1, Rafael Ramírez

  • 1Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Campus de Cantoblanco, 28049 Madrid, Spain. ch@icmm.csic.es

The Journal of Chemical Physics
|September 18, 2012
PubMed
Summary
This summary is machine-generated.

Quantum nuclear motion significantly impacts high-density amorphous (HDA) ice properties. Simulations show increased molar volume and O-H distance, with broader radial distribution peaks, highlighting quantum effects in HDA ice.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Physical Chemistry

Background:

  • High-density amorphous (HDA) ice is a non-crystalline solid water phase.
  • Understanding its structural and thermodynamic properties is crucial for various scientific fields.
  • Previous studies often relied on classical simulations, potentially missing quantum effects.

Purpose of the Study:

  • To investigate the influence of quantum nuclear motion on HDA ice properties.
  • To accurately model the behavior of HDA ice using path-integral molecular dynamics.
  • To compare quantum simulation results with classical simulations.

Main Methods:

  • Path-integral molecular dynamics simulations in the isothermal-isobaric ensemble.
  • Utilized the effective q-TIP4P/F potential for flexible water molecules.
  • Analyzed structural properties like molar volume, O-H distance, and radial distribution functions.

Main Results:

  • Quantum motion increases HDA ice molar volume by 6% at 50 K.
  • Intramolecular O-H distance rises by 1.4% due to quantum effects.
  • Peaks in the radial distribution function are broadened compared to classical simulations.
  • Bulk modulus (B) shows a linear increase with pressure (∂B/∂P = 7.1).

Conclusions:

  • Quantum nuclear motion is essential for accurately describing HDA ice properties.
  • The study provides quantitative insights into the effects of quantum mechanics on amorphous ice.
  • Results offer a basis for comparing and refining future simulations of HDA ice.