Researchers develop method to probe supercooledwater using electrondiffraction epfl_en NatureComms
The smooth evolution of the diffraction pattern of water appears inconsistent with theories that predict the liquid to undergo a first-order phase transition under our experimental conditions. In this case, one would expect to observe a signature in the temperature dependence of the structure factor. Instead, the evolution of water from its room-temperature to its low-temperature structure occurs continuously over a wide temperature interval of about 40 K, between 220 K and 260 K.
In the liquid-liquid critical point scenario, the anomalies of water arise as the liquid approaches the Widom line, which represents the locus of the maximum rate of change of its properties. Studies on transiently heated ice films find a maximum rate of change at 210 K . However, the authors note that the experiment is not sensitive to structural changes above 230 K, so that this temperature cannot be identified with the crossing of the Widom line.
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