2021/03/20 by Yanwen Sun, Gabriella Carini, G. Carini +22
Biochemistry, Genetics and Molecular Biology · Environmental Science · Physics and Astronomy · #Advanced Electron Microscopy Techniques and Applications #Advanced X-ray Imaging Techniques #Anisotropy #Electron #Femtosecond #Free electron model #Laser #Materials science #Nanosecond #Nuclear physics #Optics #Physics #Plant Water Relations and Carbon Dynamics #Speckle pattern #Spectroscopy #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.127.058001
published as Phys. Rev. Lett. 127, 058001 (2021)
arxiv created 2021/03/20 · openalex publication_date 2021/07/28 · arxiv updated 2021/08/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report observations of nanosecond nonuniform colloidal dynamics in a free flowing liquid jet using ultrafast x-ray speckle visibility spectroscopy. Utilizing a nanosecond double-bunch mode, the Linac Coherent Light Source free electron laser produced pairs of femtosecond coherent hard x-ray pulses. By exploring anisotropy in the visibility of summed speckle patterns which relates to the correlation functions, we evaluate not only the average particle flow rate in a colloidal nanoparticle jet, but also the nonuniform flow field within. The methodology presented here establishes the foundation for the study of nano- and atomic-scale inhomogeneous fluctuations in complex matter using x-ray free electron laser sources.