Berlin 2005 – wissenschaftliches Programm
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A: Atomphysik
A 6: Atomic Clusters and Cold Atoms I
A 6.2: Hauptvortrag
Samstag, 5. März 2005, 11:00–11:30, HU 3075
Experimental Observation of Interatomic Coulombic Decay in Neon Dimers — •Till Jahnke1, Achim Czasch1, Markus Schöffler1, Sven Schössler1, Alexandra Knapp1, Manuel Käsz1, Jasmin Titze1, Christine Wimmer1, Katharina Kreidi1, Robert E. Grisenti1, Andre Staudte1, Ottmar Jagutzki1, Uwe Hergenhahn2, Horst Schmidt-Böcking1, and Reinhard Dörner1 — 1Institut für Kernphysik, J. W. Goethe-Universität Frankfurt am Main, Germany — 2Max-Planck-Institut für Plasmaphysik, Garching, Germany
Two decay channels of excited atoms are commonly known today: the release of energy via emission of a photon or an Auger electron. Recently, Cederbaum et al. predicted a third decay mechanism termed Interatomic Coulombic Decay (ICD). It is anticipated to become the dominant decay route, once the excited atom is placed in an environment of other atoms. In that case, the deexcitation energy is transferred by a virtual photon to a neighboring atom, which releases it by emission of a weakly bound electron.
In the current experimental work the process is unambiguously identified after creating an inner valence hole in a neon dimer. Using an adopted version of the well established COLTRIMS-technique, the momenta of the ICD electron and the two ionic fragments of the dimer are measured in coincidence, allowing for the identification of the ICD process by the sum energy of the measured particles. Experimental results including the kinetic energy release of the dimer’s Coulomb explosion and the ICD-electron’s energy and angular distribution will be presented.