Münster 1997 – scientific programme

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CP: Chemische Physik

CP 2: Konjugierte Polymere C₆₀, Edelgasmatrizen, Magnetismus Molekularer Systeme

CP 2.3: Talk

Monday, March 17, 1997, 10:45–11:00, Gl

Electronic structure of the heterofullerene (C₅₉N)₂ and its alkali salts — •R. Friedlein¹, S. Haffner¹, T. Pichler¹, M. Knupfer¹, M. S. Golden¹, J. Fink¹, W. Andreoni², A. Curioni², A. Sastre³, M. Keshavarez-K³, C. Bellavia-Lund³, J. Hummelen³, and F. Wudl³ — ¹Institut für Festkörper- und Werkstofforschung Dresden, Postfach 270016, D-01171 Dresden, Germany — ²IBM Research Division, Zürich Research Laboratory, CH-8803 Rüschlikon, Switzerland — ³Institut for Polymers and Organic Solids, UCSB, Santa Barbara, CA 93106, USA

First high energy spectroscopic investigations of the occupied and unoccupied electronic structure of a recently accessible new class of fullerene materials - the heterofullerenes - are presented. The effect of on-ball doping in C₅₉N dimers is discussed in the light of site-selective measurements using electron-energy loss spectroscopy in transmission involving both the C and N core levels. In photoemission experiments we obtained information on the valence band electronic structure giving further evidence for the localized nature of the ’extra’ electron brought onto the fullerene ball by the N atom. When intercalating, the system reverts to a monomeric structure and forms stable A₆C₅₉N phases (A: K,Rb,Cs). We point out similarities and differences to isostructural A₆C₆₀ fulleride systems.