Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Collisions and Spectroscopy in He-Droplets

MO 16.8: Vortrag

Donnerstag, 15. März 2012, 12:15–12:30, V38.02

Investigation of Organic Molecules (PTCDA, Phthalocyanines and Porphyrines) in Helium Nanodroplets or on Neon Clusters — •Markus Müller, Matthieu Dvorak, Sebastian Müller, Lukas Schäfer, Fabian Hohnloser, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str.3, 79104 Freiburg

Organic molecules either used as organic semiconductors (PTCDA) or as dyes in organic solar cells like copper phthalocyanine (CuPc) gain high interest in their optoelectronic properties. To reveal the electronic structure of these molecules we utilize Helium Nanodroplet Isolation (HENDI) Spectroscopy, a well established method to characterize single molecules but also molecular complexes inside a cold (370mK) and weak interacting surrounding.
Laser Induced Fluorescence (LIF) excitation and emission spectra provide insight into the vibrational structure of the electronic ground state and the first electronically excited state. We present (LIF) absorption and fluorescence emission spectra of various organic molecules and complexes of them attached to helium nanodroplets. Furthermore, measurements with neon clusters have been performed in order to study the effect of the different cryogenic environment (line shifts and line broadening).