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MO: Fachverband Molekülphysik
MO 12: High Resolution Spectroscopy and Precision Experiments
MO 12.2: Vortrag
Mittwoch, 13. März 2019, 10:45–11:00, S HS 002 Biologie
Rotationally Resolved Electronic Stark Spectroscopy of 4-cyanoindole — •Marie-Luise Hebestreit, Michael Schneider, Hilda Lartian, and Michael Schmitt — Institute for Physical Chemistry I, Heinrich-Heine-University, Düsseldorf
High resolution electronic Stark spectroscopy is a valuable tool to determine the electronic nature of substituted indoles. Both, 3- and 5-cyanoindole were already investigated via high resolution spectroscopy and the electronic nature of their first excited states were identified as Lb-state for 3-cyanoindole and La-state for 5-cyanoindole, respectively. Now, 4-cyanoindole and its N-deuterated analogon were studied, evaluated via evolutionary algorithms and compared to the results of ab initio calculations. The rotational constants, permanent dipole moments in the ground and first excited state, the orientation of the transition dipole moment and the fluorescence lifetime were determined and used to indentify the lowest excited singlet state as a La-state. Finally a view on the diverging fluorescence lifetimes of different cyanoindoles is given in this talk.