Intramolecular Vibrations from Molecular Dynamics Simulations of Liquid Water

J. P. M. Postma*, H. J. C. Berendsen, T. P. Straatsma

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    Molecular dynamics simulations of liquid water using a rigid molecular model provide statistical characteristics of the forces acting on the internal degrees of freedom. This determines the perturbation of the internal oscillators, from which fundamental spectra can be derived. It turns out that the spectra are determined by the distribution of forces, causing a shift and an inhomogeneous broadening due to anharmonicity of the oscillators. This broadening and shift are related to the number and strength of the hydrogen bonds in which the molecule participates as a hydrogen bonding donor. Further causes of spectral perturbation (homogeneous broadening, intermolecular coupling, modulation by rotational motion) are negligeable. Temperature dependence of simulated spectra produce an isosbestic point, as observed experimentally, indicating the validity of a two state description.
    Original languageEnglish
    Pages (from-to)31-40
    Number of pages10
    JournalJournal de physique
    Volume45
    Issue numberNC-7
    DOIs
    Publication statusPublished - 1984

    Cite this