Femtosecond movies of water at sub-nanometer lengthscales

ORAL

Abstract

The nanometer-scale structure and picosecond-scale dynamics of water are relevant to a wide range of problems in physics, such as the hydrophobic interaction and ion hydration. The behavior of water at these scales has been subject of theoretical and MD studies for decades, and water dynamics has been recently accessed using femtosecond `pump-probe' optical experiments. We will show that it is possible to image dynamical sub-angstrom density fluctuations in water by extracting the density propagator from the dynamical structure factor measured via high-resolution inelastic x-ray scattering spectra at 3$^{rd}$ generation synchrotron sources.

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Authors

  • Robert H. Coridan

    Dept. of Physics, Dept. of Materials Science \& Engineering, F. Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign

  • Ghee Hwee Lai

    Dept. of Physics, Dept. of Materials Science \& Engineering, F. Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign, University of Illinois at Urbana-Champaign

  • Nathan S. Schmidt

    University of Illinois, Department of Physics, Dept. of Physics, Dept. of Materials Science \& Engineering, F. Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign

  • Michael Krisch

    European Synchrotron Radiation Facility, Grenoble, France

  • Peter Abbamonte

    Dept. of Physics, F. Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, IL 61801, USA, University of Illinois

  • Gerard C. L. Wong

    University of Illinois, Department of Materials Science and Engineering, Department of Physics, Department of Materials Science and Engineering, Dept. of Physics, Dept. of Bioengineering, University of Illinois at Urbana-Champaign, Dept. of Physics, Dept. of Materials Science \& Engineering, F. Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign, University of Illinois at Urbana-Champaign