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arXiv 2201.12593cond-mat.soft
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激发态布居提供液体的热力学序参量

Excitation Populations Provide a Thermodynamic Order Parameter for Liquids

Marcus T. Cicerone, Kelly Badilla-Nunez, Jessica Zahn, John P. Stoppelman, Jesse G. McDaniel

摘要:

最近的模拟和模型系统的研究表明,局部结构激发在液体和玻璃的动力学中起着重要的作用。在这里,第一次,我们量化的激发人口在真正的液体,表明其温度依赖的人口可以预测从熵和熔化焓。我们进一步表明,在第一溶剂壳层的激发人口作为一个序参量的外观的动态异质性和不同的机械制度之间的液体松弛驱动转换。我们提出了一个方案,提供了简单的物理解释这些以前神秘的液体行为方面。

英文摘要:

Recent simulation and model system studies suggest that local structural excitations play an important role in the dynamics of liquids and glasses. Here, for the first time, we quantify excitation populations in real liquids, showing that their temperature-dependent population can be predicted from entropy and enthalpy of melting. We further show that the excitation population in the first solvent shell serves as an order parameter for the appearance of dynamic heterogeneity and for driving transformations between distinct mechanistic regimes of liquid relaxation. We propose a scenario that provides simple physical explanations for these previously enigmatic aspects of liquid behavior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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