Mainz 2026 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 27: Molecular Spectroscopy II

MO 27.8: Vortrag

Donnerstag, 5. März 2026, 16:15–16:30, P 204

Towards multi-color laser action spectroscopy of highly excited H₃⁺ in the CSR — •L. Berger¹, J. Himmelsbach¹, M. Maxton¹, L. Enzmann¹, F. Grussie¹, L. Isberner¹, O. Novotný¹, V.C. Schmidt¹, D. Sharma^1,2, 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

The higher excitation spectrum above 16500 cm⁻¹ of the simplest polyatomic molecule H₃⁺ remains largely unexplored since these states are both experimentally and theoretically challenging to access. To bridge the gap to the measured but unassigned pre-dissociation spectrum above 35000 cm⁻¹ [1] a multi-color action spectroscopy scheme has been proposed [2]. In the first step, the ions are pumped from the ground state to a metastable transition state above 10000 cm⁻¹, where the molecule begins to sample linear configurations. In a second step, these ions are excited to the regime of interest above 20000 cm⁻¹ before they are dissociated with a UV laser and the dissociation products are recorded by a sensitive single particle detector. In this work we demonstrate the first step at the Cryogenic Storage Ring (CSR) in Heidelberg [3]. [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; Molecular Ions; Spectroscopy