Rostock 2019 – wissenschaftliches Programm

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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 L_b-state for 3-cyanoindole and L_a-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 L_a-state. Finally a view on the diverging fluorescence lifetimes of different cyanoindoles is given in this talk.