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MO: Molekülphysik

MO 15: Femtosekundenspektroskopie: Photoelektronen + Isomerisierung

MO 15.1: Talk

Tuesday, March 23, 2004, 16:30–16:45, HS 315

Changes of the electronic structure along the internuclear coordinate studied by ultrafast photoelectron spectroscopy: the 2¹Σ_u⁺ Na₂ double-minimum state — •Oksana Graefe, Matthias Wollenhaupt, Andreas Assion, Dirk Liese, Cristian Sarpe-Tudoran, Marc Winter, and Thomas Baumert — University of Kassel, Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

In a two-color femtosecond pump-probe experiment photoelectron spectra were detected to map the nuclear wave packet on the 2¹Σ_u⁺ Na₂ double-minimum state. The wave packet serves as a local probe for the R-dependent ionization probability. The pump photon energy of 3.65 eV allows to access a range of internuclear distances from 3 - 9 Å. The bound 1²Σ_g⁺ and the repulsive 1²Σ_u⁺ ionic states are accessible with the probe photon energy of 4.68 eV. Energy resolved photoelectron measurements permitted to rule out competing ionization pathways. Our results show that for the bound ionic state the ionization probability at the outer turning point is 4.0±0.4 times larger than that at the inner turning point.