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MO: Fachverband Molekülphysik

MO 9: Poster – Novel Approaches

MO 9.1: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Spectroelectrochemical cell designs for ultrafast spectroscopy — •Rebecca Fröhlich and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg

Charged molecules play essential roles in many photophysical and photochemical processes. Therefore, the identification of chemical redox species and the kinetic evolution of their photoexcited states is highly desirable. However, unequivocal identification of species remains challenging when reaction intermediates are chemically unstable and the dynamics take place on an ultrafast timescale. The ultrafast dynamics of specific redox species can be accessed by combining electrochemical methods with transient absorption spectroscopy [1,2]. Here, we present and compare several spectroelectrochemical cells of our own design for application in time-resolved spectroelectrochemistry. The cell designs feature flow options as well as optically transparent thin-layer geometries with the aim of realizing a simple setup and reliable performance. The advantages and drawbacks of each cell design are illustrated by performing cyclic voltammetry, absorption spectroelectrochemistry, and ultrafast transient absorption spectroscopy experiments.

[1] S. Bold et al., Chem. Commun. 54, 10594 (2018).

[2] R. Fröhlich et al., J. Chem. Phys. 160, 234201 (2024).

Keywords: spectroelectrochemistry; ultrafast; cell