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A: Fachverband Atomphysik
A 20: Poster – Atomic Clusters
A 20.2: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG
Experimental investigation of non-nearest-neighbour ICD after 2s ionization in Ne clusters — •Johannes Viehmann1, Adrian Krone1, Niklas Golchert1, Yusaku Terao1, Catmarna Küstner-Wetekam1, Lutz Marder1, Arno Ehresmann1, Noelle Walsh2, Antti Kivimäki2, and Andreas Hans1 — 1Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2MAX IV Laboratory, Lund University, Fotongatan 8, 224 84 Lund, Sweden
Interatomic Coulombic Decay (ICD) is an energy-transfer process in weakly bound matter, typically assumed to act dominantly between nearest neighbors. Following recent theoretical prediction, we report experimental evidence for non ICD. Using synchrotron radiation to ionize the Ne 2s shell in Ne clusters and electron-electron coincidence measurements with a time-of-flight spectrometer, we present ICD electron spectra that isolate decay channels beyond the nearest-neighbor shell. The data show qualitative agreement with the expected non-local ICD mechanism. Measurements were performed using the Transverse Resonance Island Buckets (TRIBs) at the MAX IV synchrotron (Lund, Sweden), enabling simultaneous multibunch and pseudo-single-bunch operation at different beamlines by adjusting the respective optics to distinct electron orbits.