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Title: Energy benchmarks for methane-water systems from quantum Monte Carlo and second-order Møller-Plesset calculations

Abstract

The quantum Monte Carlo (QMC) method is used to generate accurate energy benchmarks for methane-water clusters containing a single methane monomer and up to 20 water monomers. The benchmarks for each type of cluster are computed for a set of geometries drawn from molecular dynamics simulations. The accuracy of QMC is anticipated to be comparable with that of coupled-cluster calculations, and this is confirmed by comparisons for the CH 4-H 2O dimer. The benchmarks are used to assess the accuracy of the second-order Møller-Plesset (MP2) approximation close to the complete basis-set limit. A recently created embedded many-body technique is shown to give an efficient procedure for computing basis-set converged MP2 energies for the large clusters. It is found that MP2 values for the methane binding energies and the cohesive energies of the water clusters without methane are in close agreement with the QMC benchmarks, but the agreement is aided by partial cancelation between 2-body and beyond-2-body errors of MP2. The embedding approach allows MP2 to be applied without loss of accuracy to the methane hydrate crystal, and it is shown that the resulting methane binding energy and the cohesive energy of the water lattice agree almost exactly with recently reportedmore » QMC values« less

Authors:
 [1]; ORCiD logo [2];  [3]
  1. Univ. College London (UCL), Bloomsbury (United Kingdom). London Centre for Nanotechnology, Dept. of Physics and Astronomy, and Thomas Young Centre
  2. Univ. College London (UCL), Bloomsbury (United Kingdom). London Centre for Nanotechnology, Dept. of Physics and Astronomy, Thomas Young Centre, and Dept. of Earth Sciences
  3. Bristol Univ. (United Kingdom). School of Chemistry
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565342
Alternate Identifier(s):
OSTI ID: 1228782
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 143; Journal Issue: 10; 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

Citation Formats

Gillan, M. J., Alfè, D., and Manby, F. R. Energy benchmarks for methane-water systems from quantum Monte Carlo and second-order Møller-Plesset calculations. United States: N. p., 2015. Web. doi:10.1063/1.4926444.
Gillan, M. J., Alfè, D., & Manby, F. R. Energy benchmarks for methane-water systems from quantum Monte Carlo and second-order Møller-Plesset calculations. United States. doi:10.1063/1.4926444.
Gillan, M. J., Alfè, D., and Manby, F. R. Thu . "Energy benchmarks for methane-water systems from quantum Monte Carlo and second-order Møller-Plesset calculations". United States. doi:10.1063/1.4926444. https://www.osti.gov/servlets/purl/1565342.
@article{osti_1565342,
title = {Energy benchmarks for methane-water systems from quantum Monte Carlo and second-order Møller-Plesset calculations},
author = {Gillan, M. J. and Alfè, D. and Manby, F. R.},
abstractNote = {The quantum Monte Carlo (QMC) method is used to generate accurate energy benchmarks for methane-water clusters containing a single methane monomer and up to 20 water monomers. The benchmarks for each type of cluster are computed for a set of geometries drawn from molecular dynamics simulations. The accuracy of QMC is anticipated to be comparable with that of coupled-cluster calculations, and this is confirmed by comparisons for the CH4-H2O dimer. The benchmarks are used to assess the accuracy of the second-order Møller-Plesset (MP2) approximation close to the complete basis-set limit. A recently created embedded many-body technique is shown to give an efficient procedure for computing basis-set converged MP2 energies for the large clusters. It is found that MP2 values for the methane binding energies and the cohesive energies of the water clusters without methane are in close agreement with the QMC benchmarks, but the agreement is aided by partial cancelation between 2-body and beyond-2-body errors of MP2. The embedding approach allows MP2 to be applied without loss of accuracy to the methane hydrate crystal, and it is shown that the resulting methane binding energy and the cohesive energy of the water lattice agree almost exactly with recently reported QMC values},
doi = {10.1063/1.4926444},
journal = {Journal of Chemical Physics},
number = 10,
volume = 143,
place = {United States},
year = {2015},
month = {7}
}

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