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Relaxation time measurement: correlating diffraction patterns
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DOI：10.1093/jmicro/dfaf048.png)
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Abstract
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Dynamics in liquids and glasses can be assessed using X-ray photon correlation spectroscopy or electron correlation microscopy, which involves measuring the temporal changes in diffraction patterns. Two methods are commonly used to evaluate these temporal changes: one-time correlation function or two-time correlation function. However, the specific characteristics of these methods have not been thoroughly studied. In this study, we investigated the differences between these methods and found that the two-time correlation function can measure dynamics for longer periods than the method relying on the one-time correlation function. Additionally, we demonstrated that the two-time correlation function exhibits a weak dependence on the amount of dose applied. This study compares one-time and two-time correlation functions for analyzing temporal changes in diffraction patterns. It finds that two-time correlation functions require shorter observation times and show small sensitivity to radiation dose, highlighting the advantage of two-time correlation functions in assessing dynamics in liquids and glasses via electron diffraction.
Keywords:
diffraction
glass
4D-STEM
5D-STEM
dynamic heterogeneity
relaxation time
Journal
M
IF:
1.9
Papers:
81
Citations:
927
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Cited Papers
Development of temporal series 4D-STEM and application to relaxation time measurement.png)
Microscopy
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