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Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster: Interaction with VUV and X-ray light

A 35.15: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Time-resolved Measurement of Interatomic Coulombic Decay in Ne2 at FLASH — •Kirsten Schnorr1, Arne Senftleben1, Moritz Kurka1, Artem Rudenko2, Lutz Foucar3, Georg Schmid1, Thomas Pfeifer1, Kristina Meyer1, Denis Anielski1, Rebecca Boll1, Daniel Rolles4, Matthias Kübel5, Matthias Kling2,5, Simona Scheit6, Vitaly Averbukh7, Joachim Ullrich8, Claus-Dieter Schröter1, and Robert Moshammer11MPI für Kernphysik, Heidelberg — 2J.R. Macdonald Laboratory, Kansas — 3MPI für medizinische Forschung, Heidelberg — 4DESY, Hamburg — 5MPI für Quantenoptik, Garching — 6Goethe-Universität, Frankfurt — 7Imperial College, London — 8PTB, Braunschweig

Interatomic Coulombic Decay (ICD) is a radiationless decay mechanism in weakly bound systems, where an excited atom relaxes via an energy transfer to a van-der-Waals–bound neighbour, which then emits an electron. The process has been theoretically predicted and experimentally confirmed in clusters and molecules. The lifetime of ICD is a crucial parameter for understanding the underlying mechanism. Here, we present the first direct time-resolved measurement of an ICD lifetime, applying an XUV pump-probe scheme to the neon dimer Ne2. A 58 eV pump pulse of approximately 60 fs length creates a 2s hole, initiating the decay process, which is probed after an adjustable time delay by an exact copy of the first pulse. Whether or not ICD has happened by the time the probe pulse impinges, leads to the population of different energy levels. The resulting fragmentation channels are separated by means of a Reaction Microscope.

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