Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.29: Poster

Dienstag, 7. März 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).