Determination of Ion–Water Correlated Motions in Aqueous Salt Solutions

ORAL

Abstract

We report on the real-space correlated motion of water molecules and ions in an aqueous salt solution. The Van Hove functions of aqueous salt solution were determined by high-resolution inelastic X-ray scattering (IXS) spectra and molecular dynamics simulation. (Pseudo-) Partial Van Hove function was determined to identify the element-specific correlated motions. Our results depict the distance-dependent correlated dynamics in the picosecond time-scale and identify the changes in the anion–water correlations. It is found that the anion–water correlations show a two-step relaxation. The fast term depends on the anion type, while the slow term is hardly dependent on the anion type. This result indicates that the process governing the molecular/ionic connectivity between the water molecules and the anions is almost independent of the type of anions.

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Presenters

  • Yuya Shinohara

    Oak Ridge National Lab, Oak Ridge National Laboratory

Authors

  • Yuya Shinohara

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Ray Matsumoto

    Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA, Chemical and Biomolecular Engineering, Vanderbilt University, Vanderbilt University

  • Matthew Thompson

    Chemical and Biomolecular Engineering, Vanderbilt University, Vanderbilt University

  • Wojciech Dmowski

    University of Tennessee, Knoxville

  • Chae Woo Ryu

    University of Tennessee, Knoxville

  • Takuya Iwashita

    Oita University

  • Daisuke Ishikawa

    Japan Synchrotron Radiation Research Institute, Materials Dynamics Laboratory, RIKEN SPring-8 Center, JASRI/SPring-8

  • Alfred Q. R. Baron

    RIKEN SPring-8 Center, Materials Dynamics Laboratory, RIKEN SPring-8 Center

  • Peter Thomas Cummings

    Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, USA, Chemical and Biomolecular Engineering, Vanderbilt University, Vanderbilt University

  • Takeshi Egami

    Department of Materials Science and Engineering, University of Tennessee, Oak Ridge National Lab, University of Tennessee, Knoxville