| Issue |
Europhys. Lett.
Volume 75, Number 1, July 2006
|
|
|---|---|---|
| Page(s) | 70 - 76 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2006-10091-y | |
| Published online | 02 June 2006 | |
Adiabatic and isothermal sound waves: The case of supercritical nitrogen
1
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
Received:
18
January
2006
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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