Experimental Confirmation of the Universal Law for the Vibrational Density of States of Liquids.
Experimental Confirmation of the Universal Law for the Vibrational Density of States of Liquids.
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DOI：
10.1021/acs.jpclett.2c00297
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Caleb Stamper;D. Cortie;Z. Yue;Xiaolin Wang;D. Yu
中科院分区：
文献类型：
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作者：
Caleb Stamper;D. Cortie;Z. Yue;Xiaolin Wang;D. Yu
由于液体动力学的复杂性，描述液体振动态密度（VDOS）的分析模型一直是难以捉摸的。然而，Zaccone和Baggioli最近发展了这样一个模型，被认为是液体振动态密度的普遍规律。与固体的德拜定律g（ω）‡ ω2不同，液体的普遍定律在低能区域揭示了线性关系g（ω）‡ ω 2。我们已经证实了这一普遍规律与实验VDOS测量的非弹性中子散射真实的液体系统，包括水，液态金属，和聚合物液体，并已应用此模型提取有效的弛豫率为每种液体的短时间动态。该模型也被进一步评估，在预测的比热与现有的实验数据相比，以及通过不同的方法获得的值。
An analytical model describing the vibrational density of states (VDOS) of liquids has long been elusive, owing to the complexities of liquid dynamics. Nevertheless, Zaccone and Baggioli have recently developed such a model which was proposed to be the universal law for the vibrational density of states of liquids. Distinct from the Debye law, g(ω) ∝ ω2, for solids, the universal law for liquids reveals a linear relationship, g(ω) ∝ ω, in the low-energy region. We have confirmed this universal law with experimental VDOS measured by inelastic neutron scattering on real liquid systems including water, liquid metal, and polymer liquids, and have applied this model to extract the effective relaxation rate for the short time dynamics for each liquid. The model has also been further evaluated in the prediction of the specific heat with comparison to existing experimental data as well as with values obtained by different approaches.