Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 121: Solid-Liquid Interface IV: Structure and Spectroscopy

O 121.3: Hauptvortrag

Freitag, 20. März 2020, 11:00–11:30, TRE Phy

Photoelectron spectroscopy at liquid/solid interfaces — •Hendrik Bluhm — Fritz Haber Institute of the Max Planck Society, Berlin

Solid/liquid interfaces are ubiquitous in technological applications and the environment and govern numerous important phenomena, including corrosion, electroplating, and weathering of rocks. A detailed understanding of these processes requires the investigation of solid/liquid interfaces with chemical sensitivity and interface specificity under operating conditions. Ambient pressure X-ray photoelectron spectroscopy is an excellent method to probe the heterogeneous chemistry of these interfaces, and provides in addition the opportunity to measure the local potentials simultaneously with the chemical composition through the observation of shifts in the kinetic energy of the photoelectrons, which serve as a non-contact probe. The challenge for photoelectron experiments on solid/liquid interfaces under ambient conditions is not only the elevated pressure at which these experiments have to be carried out, but equally so the preparation of well controlled samples with high cleanliness and reproducibility. This talk shows examples of the application of APXPS to solid/liquid interfaces and discusses some of the remaining challenges that still need to be overcome in these investigations.