Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Poster – Atomic Clusters

A 20.4: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Towards experimental studies of interatomic Coulombic electron capture (ICEC) — •Andre Miranda Rocco Giraldi and Alexander Dorn — Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

This work targets the experimental detection of an environment assisted atomic decay mechanism [1], referred to in literature as excitation transfer ionization. The process constitutes the resonant excitation of a neon atom in a cluster by electron impact to a 2p5 3s or 2p5 3p state (excitation energy on the range of 16 to 19 eV), and subsequent deexcitation by ionizing a neighboring Ar atom (ionization potential of 15.8 eV). This reaction has been evidenced by laser-induced excitation of neon, but remains to be detected by means of an electron beam as the excitation mechanism. The confirmation of such process could provide insight into the role of the atomic environment on energy transfer and help gather information about ICD- and ICEC-like reactions. Presently we are adapting an electron and ion momentum spectrometer (reaction microscope) and are optimizing the formation of neon-argon dimers or bigger mixed clusters which requires the determination of the optimal conditions (nozzle temperature, gas pressure and mixing ratio). First results will be presented.

[1] Gokhberg, K. and Cederbaum, L.S. (2009). Environment assisted electron capture. Journal of Physics B: Atomic, Molecular and Optical Physics.

Keywords: interatomic coulombic electron capture; clusters; environment assisted decay