Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality

MO 10.4: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Orientation dependence in S¹⁴⁺+He₂ and S¹⁴⁺+Ne₂ collisions at an impact energy of 11.37 MeV/u: Testing the impact parameter dependent ionization probabilities P(b) of S¹⁴⁺+He and S¹⁴⁺+Ne collisions. — •H. K. Kim¹, H. Gassert¹, J. N. Titze¹, M. Waitz¹, J. Voigtsberger¹, F. Trinter¹, J. Becht¹, A. Kalinin¹, N. Neumann¹, C. Zhou², L. Ph. H. Schmidt¹, O. Jagutzki¹, A. Czasch¹, M. Schöffler¹, H. Merabet³, H. Schmidt-Böcking¹, T. Jahnke¹, H. J. Lüdde¹, A. Cassimi², and R. Dörner¹ — ¹University Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany — ²CIMAP Caen, Bd Henri Becquerel, BP 55027 * 14076 Caen Cedex 05, France — ³Qatar University, P.O. Box: 2713 Doha, Qatar

We investigated the ionization of helium dimers (He₂) and neon dimers (Ne₂) by impact of very fast (11.37 MeV/u) S¹⁴⁺ projectile ions. We detect the Coulomb fragmenting ion pairs in the final charge states (He¹⁺+ He¹⁺) and (Neⁿ⁺+ Ne^m+) with (n,m) := (1,1),(2,1),(3,1),(2,2). The events were detected in an ion-ion-electron coincidence with the COLTRIMS technique. The measured three dimensional momentum vectors allow to also access the energies and the direction in which the particles propagate. Multiple ionization shows a strong dependence on the orientation of the dimer axis with respect to the projectile beam axis. These orientation effects are attributed to the impact parameter dependent ionization probabilities P(b) for the atomic ionization processes S¹⁴⁺+He and S¹⁴⁺+Ne. By comparing the data to a Monte Carlo simulation we test these atomic P(b).