Freiburg 2024 – scientific programme
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MO: Fachverband Molekülphysik
MO 26: Cluster
MO 26.5: Talk
Friday, March 15, 2024, 15:30–15:45, HS 3042
Electron scattering in neutral water clusters — •Katinka Horn1, Svetlana Tsizin1, Loren Ban1, Sebastian Hartweg2, Petra Hoffmann1, Egor Chasovskikh1, Bruce L. Yoder1, and Ruth Signorell1 — 1ETHZ, Laboratory of Physical Chemistry, Switzerland — 2University of Freiburg, Institute of Physics, Germany
A detailed understanding of low-energy electron scattering in water (with kinetic energies below 100 eV) is crucial to modeling and controlling many processes occurring in nature, ranging from atmospheric chemistry to radiation biology. While condensed and gas phase electron scattering cross sections are known for water, analogous data for scattering in water clusters is still missing. This is the case even though clusters, often exhibiting unique/tunable properties, are of great interest for bridging the gap between the gas and condensed phases. The presented work is an extension and refinement of previous studies, providing more detailed information on electron scattering in neutral water clusters of various sizes ionized with photon energies up to ~50 eV. Electron transport scattering in water clusters was investigated by angle-resolved photoelectron spectroscopy. The scattering cross sections for the model were retrieved from cluster-size and energy resolved data contained in the photoelectron anisotropy parameter β. We found larger electron scattering cross sections for clusters than for the condensed phase, likely due to reduced dielectric screening in clusters. Good agreement to experiment is achieved with a condensed phase scattering model, using a kinetic energy and scattering channel dependent scaling of bulk cross sections.
Keywords: Electron transport scattering; Scattering model/simulations; Velocity map imaging; Photoelectron anisotropy; High harmonic radiation