Adiabatic and isothermal sound waves: the case of supercritical nitrogen

Details Adiabatic and isothermal sound waves: the case of supercritical nitrogen Adiabatic and isothermal sound waves: the case of supercritical nitrogen

2005-12-16

arxiv.org/abs/cond-mat/0512383v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures

Scientific paper

10.1209/epl/i2006-10091-y

The acoustic sound dispersion of nitrogen in its liquid and supercritical phases has been studied by Inelastic X-Ray Scattering. Approaching supercritical conditions, the gradual disappearance of the positive sound dispersion, characteristic of the low temperature liquid, is observed. In the supercritical state, evidence for a crossover between adiabatic and isothermal sound propagation regimes is inferred by an analysis of the dynamic structure factor based on generalized hydrodynamics.

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