Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.28: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Fluorescence emission spectroscopy of PTDCA in helium droplets — •Lukas Schäfer, Markus Müller, Matthieu Dvorak, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

Helium nanodroplet isolation (HENDI) spectroscopy has become a well-established technique for studying atoms, molecules and their complexes. The physical properties of helium droplets such as their low temperature (380mK), the weak interactions with atoms and molecules, and the superfluid property make them a favorite matrix for spectroscopy. We apply HENDI to investigate the emission spectra of PTCDA molecule and its complexes. PTCDA (3,4,9,10 perylene tetracarboxylic dianhydride) with its semiconducting properties is a promising material for organic device applications in light-emitting diodes and photovoltaics. Emission spectra of dimers and oligomers attached to helium nanodroplets provide insight into the vibrational structure of the electronic ground state and the first electronically excited state. Moreover, one gets information on the inter-molecular coupling and its dynamics.