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CPP: Chemische Physik und Polymerphysik

CPP 25: POSTER Electronic Structure and Spectroscopy

CPP 25.4: Poster

Donnerstag, 30. März 2006, 17:00–19:00, P2

Irradiation defects in Fluoranthene radical cation salts - an Overhausershift analysis — •Dominik Stöffler, Malte Drescher, and Elmar Dormann — Physikalisches Institut, Universität Karlsruhe (TH), D-76128 Karlsruhe, Germany

After the exposure of Fluoranthene radical cation salts with high-energetic protons, we encountered various interesting changes in their physical properties, e.g. a lowered Peierls transition temperature and an increased strength of a narrow line low temperature ESR signal. Analysing the caused defects, which can be detected at low temperatures by their Curie-paramagnetism, we hope to obtain details of the electronic and crystallographic structure. We deduce from the narrow ESR-linewidth that the electron spin is delocalised over several molecules, but it is a priori unclear if this arises from either the exchange interaction of several localized spins or the delocalisation of a single electron over multiple molecules. Method of choice is the ESR and the Overhausershift technique to gather additional information about the wave function of the unpaired electrons at low temperature.