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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Published on: December 4, 2017

High frequency dynamics in liquid Cs at high pressure.

Valentina M Giordano¹, Giulio Monaco

¹European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP440, 38043 Grenoble Cedex, France. valentina.giordano@esrf.fr

The Journal of Chemical Physics

|July 10, 2009

Summary

High pressure significantly alters liquid cesium dynamics, revealing two relaxation processes. Increased density affects structural relaxation but not acoustic damping.

Area of Science:

Condensed matter physics
Materials science
High-pressure physics

Background:

Understanding liquid dynamics under extreme conditions is crucial for materials science.
Previous studies on liquid cesium focused on room pressure dynamics.

Purpose of the Study:

Investigate the high-frequency dynamics of liquid cesium at elevated pressure (1 GPa) and temperature (493 K).
Determine the pressure dependence of dynamical properties in liquid cesium.
Identify and characterize relaxation processes under high-density conditions.

Main Methods:

Inelastic X-ray Scattering (IXS) was employed to probe high-frequency dynamics.
Analysis of IXS spectra utilized the memory function approach.
Dynamical properties were compared to room pressure data.

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Main Results:

Two distinct relaxation processes were identified: structural relaxation and a faster process.
Increased density significantly impacts the structural relaxation time.
Acoustic damping remained largely unaffected by the pressure increase.

Conclusions:

High pressure significantly modifies the structural relaxation dynamics of liquid cesium.
The observed dynamics suggest a complex interplay between density and relaxation mechanisms.
Further research is needed to fully elucidate the nature of the faster relaxation process.