We used inelastic x-ray scattering to gain insight into the complex terahertz dynamics of a diluted Au-nanoparticle suspension in glycerol. We observe that, albeit sparse, Au nanoparticles leave clear signatures on the dynamic response of the system, the main one being an additional mode propagating at the nanoparticle-glycerol interface. A Bayesian inferential analysis of the line shape reveals that such a mode, at variance with conventional acoustic modes, keeps a hydrodynamiclike behavior well beyond the continuous limit and down to subnanometer distances.

中文翻译：

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纳米粒子悬浮液的太赫兹光谱中界面波的开始。

我们使用非弹性X射线散射来了解甘油中稀释的金纳米颗粒悬浮液的复杂太赫兹动力学。我们观察到，尽管稀疏，Au纳米颗粒在系统的动态响应上仍留下清晰的特征，主要的是在纳米颗粒-甘油界面传播的另一种模式。线形的贝叶斯推论分析表明，这种模式与常规声学模式有所不同，保持了类似于流体力学的行为，该行为远远超出了连续极限并达到了亚纳米距离。