Volume 75, Number 1, July 2006
|Page(s)||70 - 76|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||02 June 2006|
Adiabatic and isothermal sound waves: The case of supercritical nitrogen
European Synchrotron Radiation Facility - B.P. 220, F-38043 Grenoble Cedex, France
2 CRS SOFT-INFM-CNR - Operative Group in Grenoble c/o ILL B.P. 220, F-38043 Grenoble Cedex, France
3 Dipartimento di Fisica and CRS SOFT-INFM-CNR Università di Roma “La Sapienza” - Roma, Italy
Accepted: 12 May 2006
The acoustic sound dispersion of nitrogen in its liquid and supercritical phase has been studied by Inelastic X-Ray Scattering (IXS). 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.
PACS: 61.10.Eq – X-ray scattering (including small-angle scattering) / 63.50.+x – Vibrational states in disordered systems / 61.20.-p – Structure of liquids
© EDP Sciences, 2006
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