Observation of the fastest chemical processes in the radiolysis of water
Z-H Loh, G Doumy, C Arnold, L Kjellsson, S Southworth, A Al Haddad, Y Kumagai, M-F Tu, P Ho, A March, R Schaller, M Bin Mohd Yusof, T Debnath, M Simon, R Welsch, L Inhester, K Khalili, K Nanda, A Krylov, S Moeller, G Coslovich, J Koralek, M Minitti, W Schlotter, J-E Rubensson, R Santra, L Young (2020) Observation of the fastest chemical processes in the radiolysis of water Science (IF: 45.8) 367(6474) 179-182Abstract
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.Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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http://www.ncbi.nlm.nih.gov/pubmed/31919219http://dx.doi.org/10.1126/science.aaz4740
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