Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 20: Poster – Molecular Spectroscopy and Dynamics
MO 20.7: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Photoelectron spectroscopy study of cold anthracene anions in gas phase — •Kevin Schwarz and Bernd von Issendorff — Institute of Physics, University of Freiburg, Hermann- Herder-Str. 3, 79104 Freiburg, Germany
Organic semiconductors like anthracene (C14H10) show interesting properties and keep being of interest across science and technology. In modified form they are used, for instance, in organic solar cells. To get a better understanding of these molecules, they are investigated in the gas phase by anion photoelectron spectroscopy (PES), providing insight into the vibrational modes of the electronic ground state and different electronically excited states of the neutral molecule as well as into electronic relaxation processes within the anion. As published previously [1], the photoelectron spectra exhibit strong photon energy-dependent changes in the vibrational excitation of the molecule. These changes result from photoemission via autodetaching excited states of the anion. Seven of eight different identified electronic excitations correspond to resonances of the anthracene anion known from absorption spectroscopy [2]. Recently, a cryogenic radio frequency hexapole ion trap was added to the device, with the goal to study the temperature dependence of the observed ultrafast relaxation processes. New results will be presented.
[1] A. Jalehdoost, B. von Issendorff, J. Chem. Phys. 158: 194302 (2023). DOI: https://doi.org/10.1063/5.0145038
[2] T. Shida and S. Iwata, J. Chem. Phys. 56: 2858-2864 (1972). DOI: https://doi.org/10.1063/1.1677618
Keywords: photoelectron spectroscopy; anthracene; gas phase