Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 15: Complex Systems in the Gas Phase

MO 15.7: Vortrag

Mittwoch, 7. März 2018, 15:30–15:45, PA 1.150

Electronic Spectra of 1,2 Dimethoxybenzene in the Gas Phase — •Christian Henrichs, Marie-Luise Hebestreit, Michael Schneider, and Michael Schmitt — Institute for Physical Chemistry I, Heinrich-Heine-University, Düsseldorf

The structural changes of 1,2 dimethoxybenzene upon excitation to the lowest electronically excited singlet state is interesting, since its two rotamers behave differently upon electronic excitation. We investigated these structural changes of 1,2 dimethoxybenzene using a combination of high resolution laser induced fluorescence spectroscopy (HRLIF) and vibronically resolved fluorescence emission spectroscopy. The HRLIF spectra yield the rotational constants of the ground and in the first excited state, which are not sufficient for a complete structural determination. The problem of fitting structural changes of 3N-6 geometry parameters to a set of only 3 rotational constants can be resolved using additional information from complementary experiments. With the aid of Franck-Condon (FC) analyses using a normal mode analysis based on the CC2/cc-pVTZ optimized structures we were able to fit the relevant parameters both to the FC intensities as well as to the rotational constants.