Mainz 2026 – scientific programme

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MO: Fachverband Molekülphysik

MO 30: Poster – Molecular Spectroscopy

MO 30.21: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 1. OG

Exploring Relaxation Mechanisms of Inner-shell Ionized Iodide Anions in Water — •Yusaku Terao, Dana Bloss, Gabriel Klassen, Johannes Viehmann, Adrian Krone, Niklas Golchert, Arno Ehresmann, and Andreas Hans — Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Strße 40, 34132 Kassel

Radiation effects in matter in aqueous environments are of great interest because many aspects remain poorly understood, although improved knowledge is essential for radiation protection and therapy. Understanding relaxation processes following excitation or ionization in biologically relevant systems requires considering interactions between solutes and surrounding water. The advent of liquid microjet techniques has enabled synchrotron-based studies of various liquid-phase phenomena. In particular, the discovery of interatomic and intermolecular decay processes, which dissipate energy and charge to neighboring species, has shown that solvation shells actively participate in post-ionization relaxation. Although these processes generally occur with lower probability than Auger decay, their identification has significantly revised the conventional picture. To the best of our knowledge, such interatomic/intermolecular decay has so far been demonstrated only for cations and dications in aqueous solution, with no clear evidence for anions. Here, we investigate iodide anions following inner-shell (3d, 4d) ionization to obtain fingerprints of possible interatomic/intermolecular decay channels and competing Auger cascades. The results were obtained using synchrotron radiation, a liquid microjet, and multielectron coincidence spectroscopy.

Keywords: Liquid jet; Electron coincidence; ICD, ETMD; Auger cascade; Radiation damage