Mesoscopic structure and dynamics of C<sub>2sub>D<sub>6sub> near the critical point

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• 作者：Pouget ; S. ; Leclercq-Hugeux ; F. ; Longelin ; S. ; Damay ; P.
• 关键词：64.60.Ht ; 61.12.Ex ; 64.70.Fx ; Structure and dynamics ; Critical phenomena ; Liquid&ndash ; gas phase transition ; Small angle neutron scattering ; Neutron spin echo spectroscopy
• 刊名：Physica B
• 出版年：2004
• 出版时间：July 15, 2004
• 年：2004
• 卷：350
• 期：1-3, Supplement
• 页码：E359-E362
• 全文大小：227 K

文摘

Both the mesoscopic structure (as seen by small angle neutron scattering (SANS)) and the dynamics (as seen by neutron spin echo (NSE) technique) of the critical fluctuations were measured in C<sub>2sub>D<sub>6sub> close to the liquid&ndash;gas phase transition. These experimental data complete previous results obtained with CO<sub>2sub>. SANS results allow a precise determination of the critical exponents ν and η, and of the universal static scaling function g(x). Correspondingly, NSE data give access to both the critical dynamic exponent z and the dynamic scaling function Ω(x). Our results evidence the limitations of the Kawasaki model.