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Characterization of the TIP4P-Ew water model: Vapor pressure and boiling point

J. Chem. Phys. 123, 194504 (2005); doi:10.1063/1.2085031

Published 14 November 2005

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Hans W. Horn, William C. Swope, and Jed W. Pitera
International Business Machines Corporation (IBM) Almaden Research Center, 650 Harry Road, San Jose, California 95120
The liquid-vapor-phase equilibrium properties of the previously developed TIP4P-Ew water model have been studied using thermodynamic integration free-energy simulation techniques in the temperature range of 274–400  K. We stress that free-energy results from simulations need to be corrected in order to be compared to the experiment. This is due to the fact that the thermodynamic end states accessible through simulations correspond to fictitious substances (classical rigid liquids and classical rigid ideal gases) while experiments operate on real substances (liquids and real gases, with quantum effects). After applying analytical corrections the vapor pressure curve obtained from simulated free-energy changes is in excellent agreement with the experimental vapor pressure curve. The boiling point of TIP4P-Ew water under ambient pressure is found to be at 370.3±1.9  K, about 7  K higher than the boiling point of TIP4P water (363.7±5.1  K; from simulations that employ finite range treatment of electrostatic and Lennard-Jones interactions). This is in contrast to the approximately +15  K by which the temperature of the density maximum and the melting temperature of TIP4P-Ew are shifted relative to TIP4P, indicating that the temperature range over which the liquid phase of TIP4P-Ew is stable is narrower than that of TIP4P and resembles more that of real water. The quality of the vapor pressure results highlights the success of TIP4P-Ew in describing the energetic and entropic aspects of intermolecular interactions in liquid water. ©2005 American Institute of Physics
History: Received 1 July 2005; accepted 26 August 2005; published 14 November 2005
Permalink: http://link.aip.org/link/?JCPSA6/123/194504/1
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KEYWORDS and PACS

Keywords
PACS
  • 65.20.+w
    Thermal properties of liquids: heat capacity, thermal expansion, etc
  • 64.70.Fx
    Liquid–vapor transitions
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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REFERENCES (36)
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