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 27.19: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Resonant Auger – ICD in O2 Dimers — •Miriam Weller, Florian Trinter, Markus Waitz, Hendrik Sann, Hong-Keun Kim, Martin Pitzer, Jörg Voigtsberger, Christian Müller, Carl Schober, Marcus Honig, Adrian Menssen, Julian Lower, Markus Schöffler, Till Jahnke, and Reinhard Dörner — Institut für Kernphysik, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany
Intermolecular Coulombic Decay (ICD) is a quick and efficient relaxation process taking place in weakly Van-der-Waals bound systems of atoms or molecules. After electronic excitation of one atom or molecule, de-excitation takes place by ionizing a neighboring atom or molecule, producing an electron of low kinetic energy. It can be triggered not only by inner-shell ionization but by various types of excitation, one of them being resonant Auger decay. For (O2)2, the reaction equation is given by: h ν (540 eV) + (O2)2 → (O2)2* → (O2)2+* + eAuger → O2+ + O2+ + eAuger + eICD
Here we experimentally prove that resonant Auger driven Intermolecular Coulombic Decay (RA-ICD) actually takes place in (O2)2 molecules on a very short timescale, much faster than the molecule’s dissociation. The experiment was carried out at BESSY II using COLd Target Recoil Ion Momentum Spectroscopy (COLTRIMS). We measured the momenta of both recoil ions and the slow electron in coincidence. We observe the ion’s energy (kinetic energy release, KER) peaking at 3.73 eV. This corresponds to an intermolecular distance of 3.86 Å of the O2-dimers, which is in good agreement to published values.