Darmstadt 2008 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

MO: Fachverband Molekülphysik

MO 25: Cluster

MO 25.1: Poster

Thursday, March 13, 2008, 16:30–19:00, Poster C1

Photoionization of He Dimers — •Tilo Havermeier, Till Jahnke, Robert Grisenti, Kathrina Kreidi, Markus Schöffler, Sven Schössler, Nadine Neumann, Jasmin Titze, Mathias Kühnel, Jörg Voigtsberger, Hendrik Sann, Robert Wallauer, Stefan Voss, Felix Sturm, Lutz Foucar, Juan Morillas, Horst Schmidt-Böcking, and Reinhard Dörner — Institut für Kernphysik, University Frankfurt, Max von Laue Str. 1, 60438 Frankfurt, Germany.

The helium dimer is one of the most weakly bound systems in the universe. This makes it an interesting quantum mechanical object for investigation. These Van der Waals Clusters can be produced in an expansion of a cryogenic gas jet through a small nozzle into vacuum. In the present experiment we examine the interaction of He dimers with synchrotron radiation at an energy range from 64 to 78 eV. We observed different pathways leading to single ionization of both He atoms of the dimer compound. This two close standing ions begin now to dissociate in cause of their coulomb potential. All charged fragments were detected in coincidence with a COLTRIMS system. Especially Interatomic Coulombic Decay (ICD) and the two step process (TS1) were clearly identified. Furthermore a distribution of the internuclear distance was obtained from the measured Kinetic Energy Release (KER).