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Maxima in the thermodynamic response and correlation functions of deeply supercooled water
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 132017 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 358, no 6370, p. 1589-1593Article in journal (Refereed) Published
Abstract [en]

Femtosecond x-ray laser pulses were used to probe micrometer-sized water droplets that were cooled down to 227 kelvin in vacuum. Isothermal compressibility and correlation length were extracted from x-ray scattering at the low-momentum transfer region. The temperature dependence of these thermodynamic response and correlation functions shows maxima at 229 kelvin for water and 233 kelvin for heavy water. In addition, we observed that the liquids undergo the fastest growth of tetrahedral structures at similar temperatures. These observations point to the existence of a Widom line, defined as the locus of maximum correlation length emanating from a critical point at positive pressures in the deeply supercooled regime. The difference in the maximum value of the isothermal compressibility between the two isotopes shows the importance of nuclear quantum effects.

Place, publisher, year, edition, pages
2017. Vol. 358, no 6370, p. 1589-1593
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Physical Sciences
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URN: urn:nbn:se:su:diva-151198DOI: 10.1126/science.aap8269ISI: 000418448000058OAI: oai:DiVA.org:su-151198DiVA, id: diva2:1172989
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-01-11Bibliographically approved

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Kim, Kyung HwanSpäh, AlexanderPathak, HarshadPerakis, FivosMariedahl, DanielAmann-Winkel, KatrinSellberg, Jonas A.Nilsson, Anders
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