动态 X 射线相干衍射分析:弥合成像与光子相关光谱之间的时间尺度
Dynamic X-ray coherent diffraction analysis: bridging the timescales between imaging and photon correlation spectroscopy
AI总结:
本文提出同步结合 CXDI 与 XPCS 的动态 X 射线相干衍射分析策略,原位观测 200 nm 金纳米颗粒的布朗运动与团聚,实现 22 ms 时间分辨率并拓展可探测时空范围。
摘要:
衍射极限光源的出现以及探测器技术的发展,为原位和工况下研究材料开辟了新的可能性。相干 X 射线衍射技术,例如相干 X 射线衍射成像(CXDI)和 X 射线光子相关光谱(XPCS),能够用于这一目的并提供互补信息;然而,由于信噪比要求,二者的同时演示一直受到限制。在此,我们展示了一种同时使用 CXDI 与 XPCS 的策略,以原位研究悬浮在甘油-水混合物中、直径为 200 nm 的胶体金纳米颗粒的布朗运动。我们可视化了团聚过程,考察了这两种技术结合后可触及的时空空间,并演示了具有 22 ms 时间分辨率的 CXDI。
英文摘要:
The advent of diffraction limited sources and developments in detector technology opens up new possibilities for the study of materials in situ and operando. Coherent X-ray diffraction techniques such as coherent X-ray diffractive imaging (CXDI) and X-ray photon correlation spectroscopy (XPCS) are capable for this purpose and provide complimentary information, although due to signal-to-noise requirements, their simultaneous demonstration has been limited. Here, we demonstrate a strategy for the simultaneous use of CXDI and XPCS to study in situ the Brownian motion of colloidal gold nanoparticles of 200 nm diameter suspended in a glycerol-water mixture. We visualise the process of agglomeration, examine the spatiotemporal space accessible with the combination of techniques, and demonstrate CXDI with 22 ms temporal resolution.
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