München 2004 – scientific programme
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MO: Molekülphysik
MO 19: Cluster II
MO 19.6: Talk
Friday, March 26, 2004, 12:15–12:30, HS 332
HIGH RESOLUTION STUDY OF DELOCALIZED ELECTRON CLOUDS BY PHOTOIONIZATION OF C60 IN SMALL ENERGY STEPS — •Sanja Korica1, Axel Reinköster1, Burkhard Langer2, Daniel Rolles1, Slobodan Cvejanović1, Jens Viefhaus1, and Uwe Becker1 — 1Fritz-Haber-Institut der MPG, Faradayweg 4-6, D-14195 Berlin, Germany — 2Max-Born-Institut, Max-Born-Str. 2a, D-14489 Berlin, Germany
Recent measurements of the non-resonant valence photoemission of C60 in the oscillatory regime have shown that advanced theoretical calculations are capable to describe the measured cross-section behavior in great detail [1]. We have made measurements with high photon energy resolution and small energy steps in order to reveal the predicted resonance structures experimentally. The characteristic oscillations in the partial photoionization cross sections of C60 are analysed in terms of geometrical properties of both, the cage structure and the distribution of the delocalized electron cloud of the highest occupied molecular orbitals. The analysis is based on the Fourier transform of the cross section oscillations, the results are corroborated by different theoretical models. In contrast to this good overall agreement between theory and experiment there is striking disagreement with respect to discrete resonance structure in the partial cross sections predicted by the theoretical calculations. Possible reasons for this behavior are discussed.
[1] A. Rüdel, R. Hentges, U. Becker, H.S. Chakraborty, M.E. Madjet, and J.M. Rost, Phys. Rev. Lett. 89 (2002), 125503 and references therein