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MO: Fachverband Molekülphysik

MO 24: Molecular Spectroscopy I

MO 24.6: Vortrag

Donnerstag, 5. März 2026, 12:30–12:45, P 204

Photoelectron Spectroscopy and dissociative photoionization of nitrogen heterocycles — •Domenik Schleier¹, Jordy Bouwman², Helgi Hrodmarsson³, Andras Boedi⁴, Patrick Hemberger⁴, and Otto Dopfer¹ — ¹Institut für Physik und Astronomie, TU Berlin, Germany — ²Department of Chemistry, CU Boulder, USA — ³Laboratoire Inter-Universitaire des Systèmes Atmosphérique, Paris, France — ⁴Paul-Scherrer-Institute, Villigen, Switzerland

Polycyclic aromatic hydrocarbons (PAHs) and their nitrogen-containing counterparts (PANHs) are ubiquitous in extraterrestrial environments ranging from planetary atmospheres to the interstellar medium. However, only large PA(N)Hs survive the extreme conditions, whereas smaller ones are destroyed. In this work, three nitrogen-containing PANH isomers of C8H6N2 composition have been studied by mass-selected threshold photoelectron spectroscopy and dissociative photoionization in a double imaging photoelectron photoion coincidence (i2PEPICO) apparatus at the VUV beamline of the Swiss Light Source. The experimental findings are supported by quantum chemical calculations and energy-dependent unimolecular dissociation rates for each channel were calculated as a function of internal energy based on RRKM statistical rate theory. The isomers show characteristic dissociation pathways that lead to the elimination of HCN, N2 and H fragments depending on the relative nitrogen position.

Keywords: Photoelectron Spectroscopy; Synchrotron Radiation; Aromatic Molecules; Astrochemistry