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| Home > Publications database > Isotope effects in dynamics of water isotopologues induced by core ionization at an x-ray free-electron laser |
| Home > Publications database > Isotope effects in dynamics of water isotopologues induced by core ionization at an x-ray free-electron laser |
| Journal Article | PUBDB-2023-03602 |
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2023
AIP Publishing LLC
Melville, NY
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Please use a persistent id in citations: doi:10.1063/4.0000197 doi:10.3204/PUBDB-2023-03602
Abstract: Dynamical response of water exposed to x-rays is of utmost importance in a wealth of scienceareas. We exposed isolated water isotopologues to short x-ray pulses from a free-electron laserand detected momenta of all produced ions in coincidence. By combining experimental resultsand theoretical modelling, we identify significant structural dynamics with characteristicisotope effects in H$_2$O$^{2+}$ , D$_2$O$^{2+}$ , and HDO$^{2+}$ , such as asymmetric bond elongation and bond-angle opening, leading to two-body or three-body fragmentation on a timescale of a fewfemtoseconds. A method to disentangle the sequences of events taking place upon theconsecutive absorption of two x-ray photons is described. Methodological access to thestructural properties and dynamics of dissociating water isotopologues exposed to x-rays opensthe way to a broader understanding of aqueous systems of biological interest.
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