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Pressure Effects on Water Dynamics by Time-Resolved Optical Kerr Effect.

Andrea Taschin¹, Paolo Bartolini¹, Samuele Fanetti^1,2

¹European Laboratory for Non-Linear Spectroscopy (LENS), Università di Firenze, via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy.

The Journal of Physical Chemistry Letters

|March 28, 2020

Summary

This summary is machine-generated.

Researchers investigated water

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Area of Science:

Physical Chemistry
Thermodynamics
Materials Science

Background:

Water exhibits unusual thermodynamic and dynamic properties in its liquid and supercooled states.
The exact nature of these liquid phases remains a subject of scientific debate.

Purpose of the Study:

To investigate the thermodynamic and dynamical anomalies of water under varying pressure conditions.
To explore the behavior of water in its supercooled metastable phase.

Main Methods:

Utilized the optical Kerr effect to measure water properties.
Conducted experiments at two isotherms (273 K and 297 K) across a wide pressure range (0.1 to 1350 MPa).

Main Results:

Observed peculiar pressure dependencies in structural relaxation and low-frequency vibrational dynamics.
Data suggests a crossover area in the water phase diagram.
Identified two distinct dynamic regimes related to high-density and low-density water forms.

Conclusions:

The study provides evidence for two distinct dynamic regimes in liquid water.
These regimes are linked to different forms of water (high-density and low-density).
A crossover area in the phase diagram separates these dynamic behaviors.