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Supercritical water has liquid-like and gas-like regimes which are seperated by the so-called Widom line. © Christoph Schran

NEW INSIGHTS INTO THE SUPERCRITICAL STATE OF WATER

Phys. Rev. Let.: Using molecular dynamics simulations, the team of RESOLV PI Prof. Dominik Marx analysed how to study the Widom line experimentally by means of terahertz spectroscopy.

At temperatures of approx. 375 degrees Celsius and a pressure 220 times higher than normal, water reaches the supercritical state, where the liquid and the gaseous phases can no longer be clearly distinguished – according to traditional text-book opinion.


“Arguments that the supercritical state might be subdivided into a gas-like and a liquid-like regime, separated by the so-called Widom line, haven’t been put forward until a few years ago,” explains Christoph Schran from the Center for Theoretical Chemistry at the Ruhr-Universität Bochum, headed by Prof Dr Dominik Marx.

 

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