Bonn 2025 – wissenschaftliches Programm

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SYML: Symposium Molecular Spectroscopy of Liquid Jets

SYML 1: Molecular Spectroscopy in Liquid Jets

SYML 1.1: Hauptvortrag

Montag, 10. März 2025, 11:00–11:30, HS 1+2

The challenging road to work function measurements from aqueous solutions — •Bernd Winter — Fritz-Haber-Institut, Faradayweg 4-6, 14195 Berlin

Electronic structure of liquid water and aqueous solutions is accessible by liquid-jet photoelectron spectroscopy (LJ-PES). Photoelectron spectra are typically referenced to the vacuum level which would be difficult to relate to explicit surface properties such as the work function of aqueous solutions. We discuss how the latter can be inferred from a LJ-PES measurement, based on an explicit consideration of a solution's Fermi energy / electrochemical potential. Competing surface-charging effects contributing to energy shifts of solute and solvent spectral features are important to be quantified and will be explored. This inherently connects to the ability to extract accurate electron binding energies from aqueous-solution microjets.

Keywords: electronic structure; liquid jet photoelectron spectroscopy; liquid water and aqueous solutions; workfunction; electrokinetc charging