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Lehmkühler, Felix; Dallari, Francesco; Jain, Avni; Sikorski, Marcin; Möller, Johannes; Frenzel, Lara; Lokteva, Irina; Mills, Grant; Walther, Michael; Sinn, Harald; Schulz, Florian; Dartsch, Michael; Markmann, Verena; Bean, Richard; Kim, Yoonhee; Vagovic, Patrik; Madsen, Anders; Mancuso, Adrian P.; Grübel, Gerhard
Proceedings of the National Academy of Sciences - PNAS, 09/2020, Letnik: 117, Številka: 39Journal Article
Dynamics and kinetics in soft matter physics, biology, and nanoscience frequently occur on fast (sub)microsecond but not ultrafast timescales which are difficult to probe experimentally. The European X-ray Free-Electron Laser (European XFEL), a megahertz hard X-ray Free-Electron Laser source, enables such experiments via taking series of diffraction patterns at repetition rates of up to 4.5 MHz. Here, we demonstrate X-ray photon correlation spectroscopy (XPCS) with submicrosecond time resolution of soft matter samples at the European XFEL.We show that the XFEL driven by a superconducting accelerator provides unprecedented beam stability within a pulse train. We performed microsecond sequential XPCS experiments probing equilibrium and nonequilibrium diffusion dynamics in water. We find nonlinear heating on microsecond timescales with dynamics beyond hot Brownian motion and superheated water states persisting up to 100 μs at high fluences. At short times up to 20 μs we observe that the dynamics do not obey the Stokes–Einstein predictions.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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