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Ultrafast nonthermal heating of water initiated by an X-ray Free-Electron Laser.

ABSTRACT: The bright ultrafast pulses of X-ray Free-Electron Lasers allow investigation into the structure of matter under extreme conditions. We have used single pulses to ionize and probe water as it undergoes a phase transition from liquid to plasma. We report changes in the structure of liquid water on a femtosecond time scale when irradiated by single 6.86 keV X-ray pulses of more than 106 J/cm2 These observations are supported by simulations based on molecular dynamics and plasma dynamics of a water system that is rapidly ionized and driven out of equilibrium. This exotic ionic and disordered state with the density of a liquid is suggested to be structurally different from a neutral thermally disordered state.

SUBMITTER: Beyerlein KR 

PROVIDER: S-EPMC5984484 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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The bright ultrafast pulses of X-ray Free-Electron Lasers allow investigation into the structure of matter under extreme conditions. We have used single pulses to ionize and probe water as it undergoes a phase transition from liquid to plasma. We report changes in the structure of liquid water on a femtosecond time scale when irradiated by single 6.86 keV X-ray pulses of more than 10<sup>6</sup> J/cm<sup>2</sup> These observations are supported by simulations based on molecular dynamics and plas  ...[more]

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