Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 30: Poster – Molecular Spectroscopy
MO 30.7: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG
Implementing a multi-color laser action spectroscopy setup to measure highly excited states of H3+ ions in the CSR — •J. Himmelsbach1, L. Berger1, M. Maxton1, L. Enzmann1, F. Grussie1, L. Isberner1, O. Novotný1, V. C. Schmidt1, D. Sharma1,2, A. Znotins1, and H. Kreckel1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel
H3+ is one of the main drivers for astrochemistry in diffuse interstellar clouds and serves as a benchmark for theory as the simplest polyatomic molecule. Despite being extensively studied in the past, its highly excited states above 16 500 cm−1 remain largely unexplored, as they are both experimentally and theoretically challenging to access. A multi-color action spectroscopy scheme has been proposed to measure states above 20 000 cm−1 [1], providing a bridge to the unassigned pre-dissociation spectrum around 35 000 cm−1 [2]. In this approach, cold molecules stored in the Cryogenic Storage Ring (CSR) are excited in two steps from their ground state into the region of interest via a long-lived metastable state. The molecule is then dissociated with a UV laser to measure the fragments using a single particle detector. Recently, the first excitation step has been successfully demonstrated [3]. This poster focuses on the experimental realization of the second excitation step and the final dissociation step. [1] Carrington et al., Acc. Chem. Res. 22, 218-222 (1989). [2] Znotins et al., J. Mol. Spectrosc. 378, 111476 (2021). [3] Maxton, Master Thesis (2025)
Keywords: Storage Ring; Spectroscopy; Molecular Ions