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A: Fachverband Atomphysik

A 22: Electron scattering and recombination I

A 22.6: Talk

Thursday, March 17, 2011, 15:30–15:45, BAR 106

Electron Impact Ionization of Small Rare Gas Clusters — •Thomas Pflüger, Xueguang Ren, Alexander Dorn, and Joachim Ullrich — Max-Planck-Institut für Kernpysik

Atomic and molecular clusters present an excellent field of investigation bridging the gap between sole constituents and macroscopic matter. Therefore, structural as well as dynamical information can contribute to the understanding of more complex systems. Kinematically complete electron impact ionization experiments at projectile energies below 100 eV were performed and differential cross sections for various kinematics could be obtained. A highly efficient advanced reaction microscope (RM) was used to detect all charged final state particles over almost the complete solid angle. The selected targets were small Argon and Neon clusters where a variety of reaction channels could be explored. The ion signals show no indication for a direct creation of a respective cluster ion with a size larger than two. Due to the selected kinematic conditions a strong involvement of the residual ionic potential in the scattering process was forced and, therefore, structural differences of the target can result in diverse scattering dynamics. Focusing on the direct single ionization of the dimer, three-fold differential 3D cross sections will be presented. They reveal enhanced out-of-plane intensities with dramatically different features over the respective atomic data.