Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Atomic systems in external fields

A 20.1: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Following the Evolution of ICD in Time — •Fawad Karimi, Markus Pfau, Martin Ranke, Anastasios Dimitriou, and Ulrike Frühling — Institute of Experimental Physics, University of Hamburg, Center of Ultrafast Imaging (CUI), Center for Free Electron Lasers (CFEL)

Interatomic Coulombic Decay (ICD), a non-local auto-ionization process predicted by Lorenz Cederbaum in 1997, is an efficient decay channel used by atoms in loosely bound van der Waals rare gas molecules and clusters. We aim to investigate the ICD lifetime in Neon-Krypton dimers. The dimers are formed in a co-expansion of a NeKr gas mixture under high pressure through an aperture in vacuum. Ultrashort XUV pulses generated by the process of HHG initiates the ICD process by ionizing an inner valence electron of Ne. The relaxation energy of Ne is transferred to the neighbouring Kr atom in form of a virtual photon. The whole process leaves two ionized atoms in a dimer which consequently undergoes a coulomb explosion. The continuum electron wave packet can be probed with an intense THz field, which is superimposed with the XUV pulses. The temporal profile of this wave carries the desired temporal information about the underlying dynamics.