Seeing real-space dynamics of liquid water through inelastic x-ray scattering

Takuya Iwashita; Bin Wu; Wei Ren Chen; Satoshi Tsutsui; Alfred Q.R. Baron; Takeshi Egami

doi:10.1126/sciadv.1603079

Seeing real-space dynamics of liquid water through inelastic x-ray scattering

Takuya Iwashita, Bin Wu, Wei Ren Chen, Satoshi Tsutsui, Alfred Q.R. Baron, Takeshi Egami

Large Scale Structures

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Abstract

Water is ubiquitous on earth, but we know little about the real-space motion of molecules in liquid water. We demonstrate that high-resolution inelastic x-ray scattering measurement over a wide range of momentum and energy transfer makes it possible to probe real-space, real-time dynamics of water molecules through the so-called Van Hove function. Water molecules are found to be strongly correlated in space and time with coupling between the first and second nearest-neighbor molecules. The local dynamic correlation of molecules observed here is crucial to a fundamental understanding of the origin of the physical properties ofwater, including viscosity. The results also suggest that the quantum-mechanical nature of hydrogen bonds could influence its dynamics. The approach used here offers a powerful experimental method for investigating real-space dynamics of liquids.

Original language	English
Article number	e1603079
Journal	Science Advances
Volume	3
Issue number	12
DOIs	https://doi.org/10.1126/sciadv.1603079
State	Published - Dec 2017

Funding

We acknowledge A. Nilsson, L. G. M. Pettersson, and A. K. Soper for the very useful discussions and suggestions. Funding: This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division, and the Office of Science Early Career Research Program. The synchrotron radiation experiments were performed at the BL35 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (proposal no. 2013B1289).

Funders	Funder number
U.S. Department of Energy
Japan Society for the Promotion of Science	16H06285
Japan Society for the Promotion of Science

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abstract = "Water is ubiquitous on earth, but we know little about the real-space motion of molecules in liquid water. We demonstrate that high-resolution inelastic x-ray scattering measurement over a wide range of momentum and energy transfer makes it possible to probe real-space, real-time dynamics of water molecules through the so-called Van Hove function. Water molecules are found to be strongly correlated in space and time with coupling between the first and second nearest-neighbor molecules. The local dynamic correlation of molecules observed here is crucial to a fundamental understanding of the origin of the physical properties ofwater, including viscosity. The results also suggest that the quantum-mechanical nature of hydrogen bonds could influence its dynamics. The approach used here offers a powerful experimental method for investigating real-space dynamics of liquids.",

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Seeing real-space dynamics of liquid water through inelastic x-ray scattering

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