Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 20: Poster Session I
A 20.29: Poster
Tuesday, March 7, 2017, 17:00–19:00, P OG1
Resonance-enhanced ICD in Neon Dimers — •Severin Meister1, Kirsten Schnorr1, Georg Schmid1, Sven Augustin1, Hannes Lindenblatt1, Florian Trost1, Yifan Liu1, Viktor Adam1, Sandra Erbel1, Claus Dieter Schröter1, Thomas Pfeifer1, Robert Moshammer1, Rolf Treusch2, Marion Kuhlmann2, and Markus Braune2 — 1Max-Planck-Institut für Kernphysik — 2Deutsches Elektron Sychrotron
Interatomic Coulombic Decay (ICD) is an efficient de-excitation mechanism in weakly bound environments. The released ICD-electron has a distinct energy and could possibly trigger successive processes. A first step towards the control of ICD, is to intentionally switch it on and off. For this, we employed the 2s-2p transition at 26.9eV (46.1nm) in Neon dimers.
In the two-photon absorption process, the first photon creates a 2p outer valence vacancy, while the second photon resonantly drives the transition Ne+(2p−1)→ Ne+(2s−1)
within the same atom. The following relaxation leads to the emission of a 2p ICD-electron in the neighboring Neon atom. Finally the two Ne+(2p−1) ions Coulomb-explode.
As one of the first experiments at FLASH2, we used the variable-gap undulators to quickly tune the photon wavelength. By scanning the resonance, we found an enhancement of a factor 2.5 for coincident Ne+(2p−1)+Ne+(2p−1) ions. Full momentum resolved, coincidence measurements were performed with a reaction microscope (FLASH-REMI).