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Title: A quantum statistical mechanical study of the enthalpy of formation of the water dimer

Abstract

Monte Carlo simulations of quantum statistical mechanical properties using the Feynman path integral method were carried out over a temperature range from 50 to 400 K to study the energetics of the water dimer (H2O)2. Here, these results were then used to understand the relation between estimates of the enthalpy of formation obtained from recent ab initio electronic structure calculations and estimates of the enthalpy of formation deduced from experimental measurements of thermal conductivity, second virial coefficients and submillimeter spectroscopy. The full quantum mechanical and anharmonic theoretical results were compared to results obtained from classical mechanical simulation and those obtained from a quantum mechanical harmonic analysis. In performing the analysis for temperatures above 200 K, the definition of a water dimer becomes poorly defined as thermal activation leading to dissociation becomes more probable. The calculated enthalpy of the dimer is strongly dependent on the manner in which trapped and independent monomer species are defined. To address these issues we employ an energy threshold as a dividing surface to separate trapped dimers from those that eventually dissociate on the time scale of an experiment. Approximate quantum mechanical expressions that are consistent with an energy definition of the water dimer were introducedmore » and used in the simulation. Lastly, it is found that experimental observations are consistent with theoretical calculations once a characteristic time scale for the experimental technique is identified.« less

Authors:
ORCiD logo [1]
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  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1490044
Report Number(s):
PNNL-SA-29295
Journal ID: ISSN 0021-9606
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 108; Journal Issue: 15; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Schenter, Gregory K. A quantum statistical mechanical study of the enthalpy of formation of the water dimer. United States: N. p., 1998. Web. doi:10.1063/1.476029.
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Schenter, Gregory K. A quantum statistical mechanical study of the enthalpy of formation of the water dimer. United States. https://doi.org/10.1063/1.476029
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Schenter, Gregory K. Wed . "A quantum statistical mechanical study of the enthalpy of formation of the water dimer". United States. https://doi.org/10.1063/1.476029. https://www.osti.gov/servlets/purl/1490044.
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@article{osti_1490044,
title = {A quantum statistical mechanical study of the enthalpy of formation of the water dimer},
author = {Schenter, Gregory K.},
abstractNote = {Monte Carlo simulations of quantum statistical mechanical properties using the Feynman path integral method were carried out over a temperature range from 50 to 400 K to study the energetics of the water dimer (H2O)2. Here, these results were then used to understand the relation between estimates of the enthalpy of formation obtained from recent ab initio electronic structure calculations and estimates of the enthalpy of formation deduced from experimental measurements of thermal conductivity, second virial coefficients and submillimeter spectroscopy. The full quantum mechanical and anharmonic theoretical results were compared to results obtained from classical mechanical simulation and those obtained from a quantum mechanical harmonic analysis. In performing the analysis for temperatures above 200 K, the definition of a water dimer becomes poorly defined as thermal activation leading to dissociation becomes more probable. The calculated enthalpy of the dimer is strongly dependent on the manner in which trapped and independent monomer species are defined. To address these issues we employ an energy threshold as a dividing surface to separate trapped dimers from those that eventually dissociate on the time scale of an experiment. Approximate quantum mechanical expressions that are consistent with an energy definition of the water dimer were introduced and used in the simulation. Lastly, it is found that experimental observations are consistent with theoretical calculations once a characteristic time scale for the experimental technique is identified.},
doi = {10.1063/1.476029},
journal = {Journal of Chemical Physics},
number = 15,
volume = 108,
place = {United States},
year = {Wed Apr 15 00:00:00 EDT 1998},
month = {Wed Apr 15 00:00:00 EDT 1998}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.476029
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Cited by: 29 works
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Figures / Tables:

FIG. 1 FIG. 1: Dependence of the average potential, $\langle$V$\rangle^{Cl}_{a}$ , on the cutoff parameter, $a$. Statistical errorbars are included and are smaller than the size of the points.
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    Works referencing / citing this record:

    Perspective: Water cluster mediated atmospheric chemistry
    journal, July 2011

    • Vaida, Veronica
    • The Journal of Chemical Physics, Vol. 135, Issue 2
    • DOI: 10.1063/1.3608919
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