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MO: Fachverband Molekülphysik
MO 1: Coulomb-explosion Imaging (joint session MO/A)
MO 1.4: Vortrag
Montag, 11. März 2024, 12:00–12:15, HS 3044
Complete imaging of the reaction pathways of ionized water dimer — •Luisa Blum1,2, Ivo S. Vinklárek1, Hubertus Bromberger1, Sebastian Trippel1, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Hamburg — 2Department of Physics, Universität Hamburg — 3Center for Ultrafast Imaging, Universität Hamburg
We applied a pure ensemble (92 %) of water dimer (H2O)2, spatially separated by electrostatic deflection, and subsequently ionized by strong-field ionization, to investigate the ion-radical chemistry of water clusters [1]. The direct observation of fragmentation channels of (H2O)2+ and (H2O)2+2 by multi-mass imaging reveals several yet unknown ion-radical pathways and provides a comprehensive picture of (H2O)2+/+2, including experimental branching ratios. Furthermore, the ion yields for the Coulomb explosion channels of (H2O)2+2 indicate electron-recollision-impact ionization as the dominant process, opening the discussion about avenues to control electron recollision and multiple-ionization processes in supramolecular complexes. The study of the (H2O)2+/+2 ionization fragmentation process is highly relevant to ion-radical heterogeneous chemistry occurring on ice mantles in the Earth’s atmosphere and in interstellar space [2].
[1] Vinklárek, I. S., Bromberger, H., Vadassery N., Jin W., Küpper, J., Trippel, S., submitted; arXiv:2308.08006 [physics].
[2] Vogt, E., Kjaergaard, H. G., Annu. Rev. Phys. Chem., 73, 209-231 (2022).
Keywords: supramolecular chemistry; electrostatic deflector; velocity map imaging; photoionization