Hannover 2013 – wissenschaftliches Programm
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SYCD: Symposium Interatomic and Intermolecular Coulombic Decay: Basic experiments and applications
SYCD 1: Interatomic and Intermolecular Coulombic Decay
SYCD 1.4: Hauptvortrag
Donnerstag, 21. März 2013, 12:30–13:00, E 415
Tracing Interatomic Coulombic Decay of Ne2 by XUV-pump–XUV-probe Experiments at FLASH — •Kirsten Schnorr1, Arne Senftleben1, Moritz Kurka1, Artem Rudenko2, Alexander Broska1, Lutz Foucar2, Matthias Kübel3, Denis Anieleski2, Thomas Pfeifer1, Kristina Meyer1, Georg Schmid1, Matthias Kling3, Joachim Ullrich1, Claus-Dieter Schröter1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Max Planck Advanced Study Group, Hamburg — 3Max-Planck-Institut für Quantenoptik
We present the first time-resolved measurement of Interatomic Coulombic Decay (ICD) in Ne2 using a XUV-pump–XUV-probe scheme at FLASH. ICD is a radiationless decay mechanism where deexcitation of one atom is achieved via an energy transfer to a van-der-Waals–bound neighbouring atom which then emits an electron. The process has been theoretically predicted and experimentally confirmed in clusters and molecules. Although the decay time of ICD is a crucial parameter for understanding the underlying mechanism, no time-resolved investigation has been performed so far.
In our measurement a 58 eV pump pulse of approximately 60 fs creates a 2s hole, initiating the decay process which is probed after an adjustable time delay by an exact copy of the first pulse. Only if the decay has happened by the time the probe pulse arrives, a certain energy level is populated. The resluting fragmentation channel can be seperated by using a Reaction Micrsoscope which allows us to study charged particles in coincidence.