Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets
MO 27.14: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Ion impact induced fragmentation dynamics of rare gas dimers — •H. Kim1, J. Titze1, M. Schöffler1, F. Trinter1, M. Waitz1, J. Voigtsberger1, H. Sann1, N. Neumann1, A. Czasch1, O. Jagutzki1, L. Schmidt1, T. Jahnke1, H. Schmidt-Böcking1, J. Becht1, H. Gassert1, H. Merabet2, J. Rangama3, C.L. Zhou3, A. Cassimi3, and R Dörner1 — 1Institut für Kernphysik, Goethe Universität Frankfurt, 60438 Frankfurt am Main, Germany — 2Department of Mathematics, Statistics and Physics, College of Arts and Sciences, P.O. Box: 2713 Doha, Qatar — 3CIMAP Caen, GANIL, Bd Henri Becquerel, BP 55027 * 14076 Caen Cedex 05, France
Rare gas atoms can form weakly bound molecules, held together by the van der Vaals force. We investigated the ionization fragmentation dynamics of He2 and Ne2 caused by ion impact with a COLTRIMS reaction microscope. Dependent on how electrons are removed from the dimers atomic sites different decay pathways are open. 1.) The direct mechanism, where the projectile ionizes both atoms due to 2 separate projectile-atom interactions. The impact parameter dependent ionization probability P(b) will lead to a maximum tilt angle of the molecular axis to the ion beam up to which both atoms can be ionized. Measuring this molecular orientation gives a unique tool to test the predictions of impact parameter dependence of ionization. 2.) In addition to the direct ionization mechanism, where the dimer*s atoms are subsequently ionized there is also a second mechanism, which is called the interatomic Coulombic decay (ICD). ICD probably plays a significant role for radiation damage in living tissue and for ion radiation therapy.