Journal Article

PUBDB-2024-01036

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ionization by XFEL radiation produces distinct structure in liquid water

Stransky, M.CFEL*XFEL.EU*DESY* ; Lane, T. (Corresponding author)CFEL*DESY* ; Gorel, A.Extern*XFEL.EU* ; Boutet, S.Extern* ; Schlichting, I. (Corresponding author)Extern*XFEL.EU* ; Mancuso, A.Extern*XFEL.EU* ; Jurek, Z.CFEL*DESY* ; Ziaja, B. (Corresponding author)CFEL*XFEL.EU*DESY*

2024
Springer Nature London

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Please use a persistent id in citations: doi:10.1038/s42005-024-01768-6  doi:10.3204/PUBDB-2024-01036

Abstract: In the warm dense matter (WDM) regime, where condensed, gas, and plasma phases coexist, matter frequently exhibits unusual properties that cannot be described by contemporary theory. Experiments reporting phenomena in WDM are therefore of interest to advance our physical understanding of this regime, which is found in dwarf stars, giant planets, and fusion ignition experiments. Using 7.1 keV X-ray free electron laser radiation (nominally 5×105 J/cm$^2$), we produced and probed transient WDM in liquid water. Wide-angle X-ray scattering (WAXS) from the probe reveals a new ~9 Å structure that forms within 75 fs. By 100 fs, the WAXS peak corresponding to this new structure is of comparable magnitude to the ambient water peak, which is attenuated. Simulations suggest that the experiment probes a superposition of two regimes. In the first, fluences expected at the focus severely ionize the water, which becomes effectively transparent to the probe. In the second, out-of-focus pump radiation produces O$^{1+}$ and O$^{2+}$ ions, which rearrange due to Coulombic repulsion over 10 s of fs. Our simulations account for a decrease in ambient water signal and an increase in low-angle X-ray scattering but not the experimentally observed 9 Å feature, presenting a new challenge for theory.

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Contributing Institute(s):

1. FS-CFEL-1 Fachgruppe PBIO (FS-CFEL-1-PBIO)
2. CFEL-Theory (FS-CFEL-3)
3. FS-CFEL-3 (CFEL-DESYT)
4. Gruppe CFEL-XM (FS-CFEL-XM)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2024

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Database coverage:
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