Ab initio theoretical study of temperature and density dependence of molecular and thermodynamic properties of water in the entire fluid region: Autoionization processes

Norio Yoshida, Ryosuke Ishizuka, Hirofumi Sato, Fumio Hirata

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The temperature and density dependence of the molecular and thermodynamic properties of water is investigated theoretically by means of the ab initio electronic structure theory combined with the reference interaction site model method, so-called RISM-SCF. We consider the autoionization process (H 2O + H2O ⇌ H3O+ + OH -) by regarding H2O, H3O+, and OH- as "solute" molecules in an aqueous solution and evaluate molecular geometry, electronic structure, solvation structure, and the ionic product of water (pKw) of these species as functions of thermodynamic conditions. In our previous paper, we calculated these properties by using essentially the same method in a wide range of density values (0.6-1.4 g/cm3). However, the calculation was limited at rather higher density (>0.6 g/cm3) due to the difficulty of convergence, which is inherent to the hypernetted-chain (HNC) closure. The problem is overcome in this study by employing the Kovalenko- Hirata (KH) closure which hybridizes the HNC and the mean-spherical approximation (MSA). Here, we present the results for the thermodynamic range of densities from 0.025 to 1.0 g/cm 3 and for temperatures from 300 to 800 K including the supercritical point.

Original languageEnglish
Pages (from-to)8451-8458
Number of pages8
JournalJournal of Physical Chemistry B
Volume110
Issue number16
DOIs
Publication statusPublished - Apr 27 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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