Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 39: Poster: Atomic clusters
A 39.1: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.V
Electron emission from C60 in strong FEL pulses — •Abraham Camacho, Ulf Saalman, and Jan-Michael Rost — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
Electron-energy spectra of C60 molecules induced by strong FEL radiation over a wide range of (currently experimentally available) photon energies and intensities is studied theoretically. Our microscopic model includes inner-shell photo-ionization and Auger decays and, most importantly, the dynamics due to Coulomb interaction of the released electrons. On the ground of this model, particular attention is given to two clearly identifiable limiting cases. On the one hand, for long and weak pulses, electron emission takes place sequentially leading to small interactions between outgoing electrons. On the other hand, for short and intense pulses, all the photo-electrons are emitted simultaneously and thus interaction between them is enforced. By switching on and off this interaction, we observe that the electron spectra are qualitatively different. Furthermore, a simple analytical model is proposed, which is found to be in good agreement with the microscopic model.