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MO: Fachverband Molekülphysik

MO 10: Collisions and Reactions

MO 10.3: Vortrag

Mittwoch, 11. März 2020, 11:30–11:45, f142

Excited state proton transfer in solvated molecules studied by XUV time-resolved photoelectron spectroscopy — •Evgenii Ikonnikov, Johan Hummert, and Oleg Kornilov — Max-Born-Institute, Berlin

Photoelectron pump-probe time resolved spectroscopy is a powerful tool for studies of relaxation dynamics of electronically excited states. There are many pump-probe techniques developed for the gas phase but very few implementations for liquids. However, biological molecules in natural conditions, which often interact with their environment and, due to protic and polar nature of water solvent, besides intramolecular relaxation process there are additional processes possible such as proton transfer and solvent rearrangement upon photoexcitation. In this project we study ultrafast relaxation of molecules dissolved in water. We combine visible pump/XUV probe time-resolved photoelectron spectroscopy and the microliquid jet technique with high efficiency time-of-flight electron detector based on the "magnetic bottle" design. This experimental setup allows us to measure ground state energy of dissolved molecules with concentrations down to 500 uM and follow relaxation dynamics of excited states for samples with molecular concentrations down to 2 mM. We investigate relaxation of molecules exhibiting excited state proton transfer in solvents with different pH values.