Observation of the fastest chemical processes in the radiolysis of water

Z-H Loh, G Doumy, C Arnold, L Kjellsson, S H Southworth, A Al Haddad, Y Kumagai, M-F Tu, P J Ho, A M March, R D Schaller, M S Bin Mohd Yusof, T Debnath, M Simon, R Welsch, L Inhester, Khadijeh Khalili, K Nanda, A I Krylov, S MoellerG Coslovich, J Koralek, M P Minitti, W F Schlotter, J-E Rubensson, R Santra, L Young

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Elementary processes associated with ionization of liquid water provide a framework for understanding radiation-matter interactions in chemistry and biology. Although numerous studies have been conducted on the dynamics of the hydrated electron, its partner arising from ionization of liquid water, H2O+, remains elusive. We used tunable femtosecond soft x-ray pulses from an x-ray free electron laser to reveal the dynamics of the valence hole created by strong-field ionization and to track the primary proton transfer reaction giving rise to the formation of OH. The isolated resonance associated with the valence hole (H2O+/OH) enabled straightforward detection. Molecular dynamics simulations revealed that the x-ray spectra are sensitive to structural dynamics at the ionization site. We found signatures of hydrated-electron dynamics in the x-ray spectrum.
Original languageEnglish
Issue number6474
Pages (from-to)179-182
Publication statusPublished - 2020


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