Darmstadt 2008 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Cluster
MO 14.6: Vortrag
Donnerstag, 13. März 2008, 09:45–10:00, 3G
Study of autodetachment effects in the photoemission of fullerene anions — •Mattias Svanqvist, Raphael Kuhnen, Christine Wehrstein, and Bernd v. Issendorff — Fakultät für Physik, Universität Freiburg, Stefan Meier Straße 21, 79104 Freiburg
The electronic valence structure of fullerenes is determined by the delocalized π-band which can be seen as a spherical two-dimensional electron gas. This makes fullerenes interesting model systems for the study of excitation and relaxation processes in a highly correlated many-electron systems.
In photoelectron spectra of C60− irradiated by ns-laserpulses evidence of
electron Auger-like auto-detachment processes have been observed1. To verify this peak in the photoelectron spectra as indeed originating from an auto-detachment processes we have conducted a detailed study by scanning a wavelength range of 266 to 322 nm. This shows a linear dependence of the peak position in the binding energy spectras on the photon energy, as expected for auto-detachment, and allows to determine the excitation energy of the autodetaching state as about 3.5 eV.
1X.-B. Wang et al, J. Chem. Phys. 110, 8217 (1999)