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Structural Dynamics of Materials Probed by X-Ray Photon Correlation Spectroscopy

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Synchrotron Light Sources and Free-Electron Lasers

Abstract

In this chapter we discuss coherent X-ray scattering, photon statistics of speckle patterns, and X-ray photon correlation spectroscopy (XPCS). XPCS is a coherent X-ray scattering technique used to characterize dynamic properties of condensed matter by recording a fluctuating speckle pattern. In the experiments, the time-correlation function of the scattered intensity is calculated at different momentum transfers Q, and thereby detailed information about the dynamics is obtained. Recently, XPCS applications have broadened to include the study of nonequilibrium and heterogeneous dynamics, e.g., in systems close to jamming or at the glass transition. This is enabled through multi-speckle techniques where a 2D area detector (CCD or pixel detector) is employed and the correlation function is evaluated by averaging over subsets of equivalent pixels (same Q). In this manner time averaging can be avoided, and the time-dependent dynamics is quantified by so-called two-time correlation functions. Higher-order correlation functions may also be calculated to investigate questions related to non-Gaussian dynamics and dynamical heterogeneity. We discuss recent forefront applications of XPCS in the study of soft and hard condensed matter dynamics.

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Correspondence to Anders Madsen .

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Madsen, A., Fluerasu, A., Ruta, B. (2020). Structural Dynamics of Materials Probed by X-Ray Photon Correlation Spectroscopy. In: Jaeschke, E., Khan, S., Schneider, J., Hastings, J. (eds) Synchrotron Light Sources and Free-Electron Lasers. Springer, Cham. https://doi.org/10.1007/978-3-030-23201-6_29

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