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Publication Detail
Ab initio statistical mechanics of surface adsorption and desorption. II. Nuclear quantum effects
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Alfe D, Gillan MJ
  • Publisher:
    AMER INST PHYSICS
  • Publication date:
    28/07/2010
  • Journal:
    J CHEM PHYS
  • Volume:
    133
  • Issue:
    4
  • Print ISSN:
    0021-9606
  • Language:
    EN
  • Keywords:
    AUGMENTED-WAVE METHOD, MOLECULAR-DYNAMICS, MONTE-CARLO, PARTIAL DISSOCIATION, WATER, ENERGY, TEMPERATURE, SIMULATIONS, INCREMENTS, EFFICIENT
  • Addresses:
    Alfe, D
    UCL
    Dept Earth Sci
    London
    W1CE 6BT
    England

    UCL
    Thomas Young Ctr
    London
    WC1H 0AH
    England

    UCL
    Dept Phys
    London
    W1CE 6BT
    England
Abstract
We show how the path-integral formulation of quantum statistical mechanics can be used to construct practical ab initio techniques for computing the chemical potential of molecules adsorbed on surfaces, with full inclusion of quantum nuclear effects. The techniques we describe are based on the computation of the potential of mean force on a chosen molecule and generalize the techniques developed recently for classical nuclei. We present practical calculations based on density functional theory with a generalized-gradient exchange-correlation functional for the case of H2O on the MgO (001) surface at low coverage. We note that the very high vibrational frequencies of the H2O molecule would normally require very large numbers of time slices (beads) in path-integral calculations, but we show that this requirement can be dramatically reduced by employing the idea of thermodynamic integration with respect to the number of beads. The validity and correctness of our path-integral calculations on the H2O/MgO(001) system are demonstrated by supporting calculations on a set of simple model systems for which quantum contributions to the free energy are known exactly from analytic arguments. (C) 2010 American Institute of Physics. [doi:10.1063/1.3466919]
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Dept of Earth Sciences
London Centre for Nanotechnology
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