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    Local structure analysis in ab initio liquid water

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    Genre
    Journal Article
    Date
    2015-01-01
    Author
    Santra, B
    DiStasio, RA
    Martelli, F
    Car, R
    Subject
    Ab initio molecular dynamics
    liquid water
    amorphous ice
    van der Waals
    hydrogen bond
    local structure index
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5836
    
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    DOI
    10.1080/00268976.2015.1058432
    Abstract
    © 2015 © 2015 Taylor & Francis. Within the framework of density functional theory, the inclusion of exact exchange and non-local van der Waals/dispersion (vdW) interactions is crucial for predicting a microscopic structure of ambient liquid water that quantitatively agrees with experiment. In this work, we have used the local structure index (LSI) order parameter to analyse the local structure in such highly accurate ab initio liquid water. At ambient conditions, the LSI probability distribution, P(I), was unimodal with most water molecules characterised by more disordered high-density-like local environments. With thermal excitations removed, the resultant bimodal P(I) in the inherent potential energy surface (IPES) exhibited a 3:1 ratio between high-density- and low-density-like molecules, with the latter forming small connected clusters amid the predominant population. By considering the spatial correlations and hydrogen bond network topologies among water molecules with the same LSI identities, we demonstrate that the signatures of the experimentally observed low- and high-density amorphous phases of ice are present in the IPES of ambient liquid water. Analysis of the LSI autocorrelation function uncovered a persistence time of ∼ 4 ps - a finding consistent with the fact that natural thermal fluctuations are responsible for transitions between these distinct yet transient local aqueous environments in ambient liquid water.
    Citation to related work
    Informa UK Limited
    Has part
    Molecular Physics
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5818
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