期刊
PHYSICAL REVIEW RESEARCH
卷 4, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.4.L032012
关键词
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资金
- Swedish Research council [2018-07152]
- Swedish Governmental Agency for Innovation Systems [2018-04969]
- Formas [2019-02496]
- Swedish National Research Council (Vetenskapsradet) [2019-06075, 2019-05542]
- Center of Molecular Water Science (CMWS) of DESY in an Early Science Project
- MaxWater initiative of the Max-Planck-Gesellschaft
- Wenner-Gren Foundations
- Swedish Research Council [2019-06075, 2019-05542] Funding Source: Swedish Research Council
This study demonstrates an experimental proof of concept for nanofocused x-ray photon correlation spectroscopy, using a novel event-based x-ray detector to capture nanoparticle structural dynamics with microsecond resolution. The research shows the impact of nanobeam size on small-angle scattering lineshape and diffusion coefficients obtained from nano-XPCS.
Here, we demonstrate an experimental proof of concept for nanofocused x-ray photon correlation spectroscopy, a technique sensitive to nanoscale fluctuations present in a broad range of systems. The experiment, performed at the NanoMAX beamline at MAX IV, uses a novel event-based x-ray detector to capture nanopar-ticle structural dynamics with microsecond resolution. By varying the nanobeam size from sigma = 88 nm to sigma = 2.5 mu m, we quantify the effect of the nanofocus on the small-angle scattering lineshape and on the diffusion coefficients obtained from nano-XPCS. We observe that the use of nanobeams leads to a multifold increase in speckle contrast, which greatly improves the experimental signal-to-noise ratio, quantified from the two-time intensity correlation functions. We conclude that it is possible to account for influence of the high beam divergence on the lineshape and measured dynamics by including a convolution with the nanobeam profile in the model.
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