期刊
EUROPHYSICS LETTERS
卷 75, 期 1, 页码 70-76出版社
EDP SCIENCES S A
DOI: 10.1209/epl/i2006-10091-y
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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.
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