纳秒X射线散斑可见度光谱探测纳米尺度非均匀动力学
Nanoscale heterogeneous dynamics probed by nanosecond x-ray speckle visibility spectroscopy
摘要：
我们报告了纳秒纳米尺度的非均匀动力学在一个自由流动的胶体射流揭示超快X射线斑点可见度光谱观察。直线加速器相干光源自由电子激光器的纳秒双聚束模式使得能够产生飞秒相干硬X射线脉冲对。通过探索与关联函数相关的各向异性总和散斑可见度，我们不仅能够评估胶体纳米粒子射流中的平均粒子流率，而且能够评估其中的非均匀流场。这里提出的方法建立了纳米和原子尺度的异质性波动在复杂的物质使用X射线自由电子激光源的研究基础。
英文摘要：
We report observations of nanosecond nanometer scale heterogeneous dynamics in a free flowing colloidal jet revealed by ultrafast x-ray speckle visibility spectroscopy. The nanosecond double-bunch mode of the Linac Coherent Light Source free electron laser enabled the production of pairs of femtosecond coherent hard x-ray pulses. By exploring the anisotropic summed speckle visibility which relates to the correlation functions, we are able to evaluate not only the average particle flow rate in a colloidal nanoparticle jet, but also the heterogeneous flow field within. The reported methodology presented here establishes the foundation for the study of nano- and atomic-scale heterogeneous fluctuations in complex matter using x-ray free electron laser sources.
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