SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DS: Fachverband Dünne Schichten
DS 13: Optical Analysis of Thin Films I
DS 13.1: Hauptvortrag
Donnerstag, 30. März 2023, 09:30–10:00, SCH A 316
Towards Catalytic Applications of Infrared Laser Polarimetry — •Andreas Furchner1 and Karsten Hinrichs2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Division Energy and Information, Schwarzschildstraße 8, 12489 Berlin, Germany — 2Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V.
Infrared (IR) polarimetry and ellipsometry are well-established non-destructive spectroscopic techniques for studying the refractive and absorptive properties of thin films and surfaces with monolayer sensitivity. This spectral range is particularly suited for investigating chemical composition, molecular interactions, anisotropy, conductivity, as well as changes and reactions at surfaces and interfaces.
The incorporation of quantum cascade lasers (QCLs) in novel IR polarimeter designs has pushed the boundaries of the achievable spatial and temporal resolution well into the sub-mm and sub-second range, respectively. Laser-based polarimeters thus enable hyperspectral and time-resolved amplitude–phase measurements with novel application potential. Probing individual laser pulses delivers time resolutions of 10 µs, spectral sweeps in 100 ms, and hyperspectral maps in minutes.
This presentation focuses on recent instrumental developments, such as the combination of QCLs with single-shot designs, that pave the way towards the application of IR laser polarimetry in thin-film catalysis. Here, surface reactions have to be studied in situ and operando in order to resolve the evolution of surface species and temporary adsorbates.