Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 11: Posters 2: Novelties in Molecular Physics

MO 11.18: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Investigation of Organic Complexes in Helium Nanodroplets — •Alexander Ruf, Markus Müller, Sharareh Izadnia, Aaron La Forge, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str.3, 79104 Freiburg

Organic molecules used as either organic semiconductors or as dyes in organic solar cells have gained high interest due to their optoelectronic properties. To reveal the electronic structure of these molecules, we use Helium Nanodroplet Isolation Spectroscopy, a well-established method to characterize both single molecules and molecular complexes inside a cold (370mK), weakly-interacting environment.

Typically, for radiative complexes or single molecules, Laser Induced Fluorescence (LIF) excitation and emission spectra is used to give spectroscopic insight into the vibrational structure of the electronic ground state and the first electronically-excited state. However, the excited states of charge-transfer-complexes (CTC), which are of particular interest for electro-optical applications, are not accessible with these techniques since their Charge-transfer-states are excited indirectly through a multi-level process and primarily de-excite nonradiatively. Therefore, entirely new experimental approaches are needed and currently being developed in our group.

We present LIF absorption and fluorescence emission spectra of various organic molecules and complexes attached to Helium Nanodroplets. Furthermore, we outline the experimental techniques designed to gain information on the non-radiative energy-transfer-processes in CTCs.