Frankfurt 2006 – scientific programme
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A: Atomphysik
A 22: Poster II: Photoionisation
A 22.12: Poster
Thursday, March 16, 2006, 16:30–18:30, Labsaal
Differences in the cross section oscillations between gasphase and amorphous fullerenes — •Sanja Korica1, Axel Reinköster1, Markus Braune1, Daniel Rolles1, Burkhard Langer2, Jens Viefhaus1, and Uwe Becker1 — 1Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin — 2Institut für Physikalische Chemie I, Universität Würzburg, Am Hubland, 97074 Würzburg
We have performed high resolution measurements of emitted photoelectrons from the valence shell of C70, in the gas phase but also in an amorphous solid formation, in order to derive branching ratio and partial cross sections of the two highest molecular orbitals HOMO and HOMO-1. The experiments have been performed at the beamline BW3 at HASYLAB (DESY) using monochromatized synchrotron radiation and time-of-flight (TOF) detection of photoelectrons. The comparison between the two phases shows an interesting and unexpected difference. The ratio between the corresponding HOMO and HOMO-1 levels, which exhibits photon energy dependent oscillations in both cases, shows an offset of 0.5 for the gas phase measurements compared to the solid state data. The latter one are constantly lower for all energies between 25 and 270 eV. This kind of behavior we did not notice in our earlier measurements for C60 with the same kind of experiment.