Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Cold Molecules (joint session MO/Q)
MO 13.5: Talk
Wednesday, March 11, 2020, 15:00–15:15, f102
Line shape investigation of the electronic origin of phthalocyanines, porphyrins and their clusters with H2O II: gas phase studies — •Florian Schlaghaufer, Johannes Fischer, and Alkwin Slenczka — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
The spectral shape of the zero-phonon-line in the electronic and Stark spectra of organic molecules such as phthalocyanines [1] and porphine [2] and their clusters with small molecules (e.g. H2O) recorded in superfluid helium nanodroplets is determined by pure molecular contributions and the influence of the helium environment. As discussed in an accompanying talk (J. Fischer), the analysis of such line shapes is not straightforward. Therefore, corresponding gas phase studies are essential for dissecting helium induced spectral features from molecular rotor fingerprints. The observed rotational band shapes of jet cooled molecules and associated simulations give insight into the structure and polarity of the molecular systems for both the ground and the electronically excited state. By means of a rule of thumb for transition from gas phase to helium droplet conditions we compare these simulations with experimental spectra measured in helium droplets. Mismatches reveal the influence of helium induced contributions to the line shapes. Ultimately, this project heads for a better understanding of microsolvation and the dynamics of electronic excitation of molecules inside superfluid helium nanodroplets.
[1] J. Chem. Phys. 2018, 148, 144301.
[2] J. Chem. Phys. 2018, 149, 244306.