Author: Amann-Winkel, K.
Paper Title Page
Searching for the Hypothesized Liquid-Liquid Critical Point in Supercooled Water with X-Ray Free Electron Laser  
  • K.H. Kim
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  • K. Amann-Winkel
    FYSIKUM, AlbaNova, Stockholm University, Stockholm, Sweden
  • A. Nilsson
    Stockholm University, Stockholm, Sweden
  Funding: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT)(No. 2019R1C1C1006643).
Water is the most important liquid for our existence on Earth and plays an essential role in physics, chemistry, biology, and geoscience. In the liquid form, water has numerous anomalous properties as compared to other liquids such as density maximum at 4-degree C. As an explanation for these anomalous experimental observations, a hypothetical liquid-liquid transition (LLT) and a liquid-liquid critical point (LLCP) has been proposed deep in the supercooled regime. Recently a new method of rapid cooling and ultrafast probing with wide-angle X-ray scattering (WAXS) using FELs (LCLS, SACLA, and PAL-XFEL) has allowed the venture into no man’s land and we found the first experimental evidence of the existence of the Widom line which is supposed to emanate from the LLCP [1]. By introducing optical pulse to the setup, pump-probe type measurements are also possible to study the liquid-liquid transition.
[1] K. H. Kim et al., "Maxima in the Thermodynamic Response and Correlation Functions of Deeply Supercooled Water", Science, 358, 1589-1593 (2017)
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