Forthcoming Events

05.09.2022 - 09.09.2022, Iseolago hotel, Iseo, Italy.


MUST2022 Conference- a great success!
New scientific highlights- by MUST PIs Wörner, Chergui, and Richardson
FELs of Europe prize for Jeremy Rouxel- “Development or innovative use of advanced instrumentation in the field of FELs”
Ruth Signorell wins Doron prizefor pioneering contributions to the field of fundamental aerosol science
New FAST-Fellow Uwe Thumm at ETH- lectures on Topics in Femto- and Attosecond Science
International Day of Women and Girls in Science- SSPh asked female scientists about their experiences
New scientific highlight- by MUST PIs Milne, Standfuss and Schertler
EU XFEL Young Scientist Award for Camila Bacellar,beamline scientist and group leader of the Alvra endstation at SwissFEL
Prizes for Giulia Mancini and Rebeca Gomez CastilloICO/IUPAP Young Scientist Prize in Optics & Ernst Haber 2021
Nobel Prize in Chemistry awarded to RESOLV Member Benjamin List- for the development of asymmetric organocatalysis
NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules
#NCCRWomen- NCCR MUST celebrates 50 years women’s right to vote in Switzerland

Capturing transient species in ionized liquid water with ultrafast x-rays

Date Fr, 06.12.2019 - Fr, 06.12.2019
Time 11:00h
Speaker Dr. Linda Young, Argonne National Laboratory, USA
Location EPF Lausanne Campus, CH G1 495
Program Abstract :
Using ultrafast x-rays to follow the dynamics of chemical reactions in liquid solutions has the potential to place condensed phase reaction dynamics on par with understanding in the gas phase. Here I address a fundamental reaction in the solution phase: proton transfer in ionized liquid water. Ionization of liquid water is a universal manifestation of the interaction of radiation with matter. The ensuing cascade of electrons, ions and radicals form the basis of solution and interfacial chemistry in aqueous environments in complex systems, e.g. organisms undergoing medical diagnosis, radiation therapy, nuclear reactors and environmental remediation. I will discuss our study of pure water and the initial ultrafast steps of the elementary proton transfer reaction : H2O+ + H2O —› OH + H3O+, triggered by strong-field ionization. X-rays are uniquely sensitive to two species in the water window, H2O+ and OH. By monitoring three photon-in/photon-out channels, x-ray transmission, total and dispersed x-ray emission as a function of x-ray photon energy and time delay, we find evidence of the elusive H2O+ radical cation as well as a clean and distinctive signature of the OH radical, complementing earlier studies in the UV. Theoretical studies using a QM/MM approach provide insight into the valence hole localization and nuclear dynamics in the water network during the proton transfer reaction and demonstrate the sensitivity of the x-ray absorption spectrum to structural dynamics near the reaction center. The RIXS spectrum of the OH radical reveals the complementary nature of x-rays relative to the UV absorption probes. Interestingly, the x-ray spectra also show sensitivity to the dynamics of the injected electron.
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