Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 10: Spectroscopy I: Ultra-short Time Spectroscopy

MO 10.10: Talk

Thursday, April 5, 2001, 18:00–18:15, H1058

Laser-induced fluorescence spectroscopy of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) in helium nanodroplets — •Markus Wewer and Frank Stienkemeier — Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany

Perylene derivatives 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA), 3,4,9,10-perylene tetracarboxylic diimide (PTCDI) and 3,4,9,10-perylene tetracarboxylic disulfide (PTCDS) are of current interest because of their electronic conductance properties and the applications as organic semi-conductors and luminescent devices. We performed laser-induced fluorescence spectroscopy of PTCDA isolated in superfluid helium nanodroplets at temperatures below 1 K. The molecules are captured during collisions in a beam of helium droplets, produced by supersonic expansion of helium gas from a cold nozzle. With this technique we obtain high resolution spectra which allow a separation of molecular and charge transfer electronic excitations. The results are compared to spectra of PTCDA on films and in solutions.