Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 15: MO Poster 3
MO 15.8: Poster
Wednesday, March 11, 2020, 17:00–19:00, Empore Lichthof
Microsolvation and rotation of *large* molecular impurities inside helium nanodroplets upon electronic excitation — •Mallikarjun Karra1, Alexander A. Auer2, Mikhail Lemeshko3, Giacomo Bighin3, Igor Cherepanov3, Giovanni Bistoni2, Johannes Fischer4, Stefan Fuchs4, Eva-Maria Lottner4, Alkwin Slenczka4, and Bretislav Friedrich4 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2Max-Planck-Institut für Kohlenforschung, Mülheim, Germany — 3Institute of Science and Technology Austria, Klosterneuburg, Germany — 4Universität Regensburg, Regensburg, Germany
High-resolution electronic spectroscopy (Stark or field-free) of large organic molecules and molecular complexes doped into superfluid helium nanodroplets poses many intriguing questions at the interface of physics and chemistry -- especially with regard to solvation and rotation. In our recent work, we have noted the apparent absence of the predicted free rotation of phthalocyanine and porphine in He droplets upon electronic excitation. Extending the study to clusters formed and probed in helium droplets, we also present our surprising finding of a lack of additional helium-stabilized phthalocyanine-water cluster configurations as compared to the gas-phase. We further investigate the absence of a rotational sub-structure in the electronic spectra of dopants larger than glyoxal via a multi-pronged approach that involves the study of the dopant-He PESs before and after electronic excitation, and the invoking of the theory of the angulon quasiparticle in the strong coupling regime.