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DOE OSTI · 2564483

Analysis strategy for ultrafast X-ray photon correlation spectroscopy

Sun, Yanwen [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)]·Sutton, Mark [McGill Univ., Montreal, QC (Canada)]·Wei, Shuai [Aarhus Univ. (Denmark)] (ORCID:0000000330512480)
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Abstract

We explain an analysis strategy for ultrafast X-ray photon correlation spectroscopy, a technique enabled by X-ray free electron lasers to probe nano- and atomic-scale dynamics in complex systems on nanosecond timescales or faster. Central to the technique is the methodology for extracting contrast in coherent X-ray diffraction patterns, known as speckle patterns. Guided by simulations, we analyze common challenges and examine errors encountered in contrast extraction. A method for accurately determining contrast amid shot noise across a wide range of count rates is presented.

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36 MATERIALS SCIENCEComplexDynamicsGlassLiquidNuclear specklesSpeckleX-Ray DiffractionX-Ray Photoelectron SpectroscopyX-Ray ScatteringX-Ray SpectroscopyX-ray CrystallographyX-ray photon correlation spectroscopy

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Sun, Yanwen [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)], Sutton, Mark [McGill Univ., Montreal, QC (Canada)], Wei, Shuai [Aarhus Univ. (Denmark)] (ORCID:0000000330512480). 2025-05-05. Analysis strategy for ultrafast X-ray photon correlation spectroscopy. https://doi.org/10.1557/s43579-025-00716-x

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36 MATERIALS SCIENCE↗