SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Poster I

MO 6.7: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Ultrafast Transient Absoprtion Spectroscopy of Metal Complexes with 10 fs Probe Pulses — •Marvin Krupp, Moritz Lang, Chris Rehhagen, and Stefan Lochbrunner — Institut für Physik, Uni Rostock, Deutschland

Most of the photoactive complexes used in chemical applications are based on rare metals like iridium or ruthenium. Replacing them with abundant metals e.g. iron is of long-standing interest, but the resulting complexes are currently limited by their photoactive properties. To analyze newly prepared iron complexes femtosecond transient absorption spectroscopy is typically used to determine the dynamics upon photoexcitation with short pump pulses and a few hundred femtoseconds long white light continuum for probing. Increasing the time resolution by reducing the pulse duration of the probe can make it possible to observe extremely fast processes below the current time resolution and give insights into the very first relaxation steps in the metal complexes such as intersystem crossing. In this work a broadband noncollinear optical parametric amplifier (NOPA) is used to generate broadband pulses with a duration below 10 fs. These pulses are used as probe light improving the time resolution in comparison to the usual CaF₂ white light. The setup was characterized with transient grating frequency-resolved optical gating (TG FROG) and first measurements on Fe-complexes are compared with respect to the two probe sources.