Origin of the λ transition in liquid sulfur
Origin of the λ transition in liquid sulfur
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DOI：
10.1103/physrevlett.99.025701
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发表时间：
2007-07-13
影响因子：
8.6
通讯作者：
Ruocco, G.
中科院分区：
文献类型：
--
作者：
Scopigno, T.;Yannopoulos, S. N.;Ruocco, G.
开发了一种新的实验技术，我们应用光子相关光谱学，使用液体硫中T λ附近的红外辐射，即，在几度内加热时观察到粘度突然增加4个数量级的温度范围内。这使我们能够克服在可见光波长的光诱导和吸收效应，以揭示一个链松弛过程的特征时间在毫秒范围内。这些结果恢复的有效性麦克斯韦关系在硫从一个明显的失败，允许合理化的机械和热力学行为，该系统内的粘弹性的情况。
Developing a novel experimental technique, we applied photon correlation spectroscopy using infrared radiation in liquid sulfur around T-lambda, i.e., in the temperature range where an abrupt increase in viscosity by 4 orders of magnitude is observed upon heating within few degrees. This allowed us-overcoming photoinduced and absorption effects at visible wavelengths-to reveal a chain relaxation process with characteristic time in the millisecond range. These results do rehabilitate the validity of the Maxwell relation in sulfur from an apparent failure, allowing rationalizing of the mechanical and thermodynamic behavior of this system within a viscoelastic scenario.