SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Electronic Spectroscopy

MO 5.5: Vortrag

Dienstag, 7. März 2023, 12:00–12:15, F142

State selective diagnostics and spectroscopy of H₃⁺ in a heavy ion storage ring — •Aigars Znotins¹, Lukas Berger¹, Florian Grussie¹, Damian Müll¹, Oldrich Novotny¹, Felix Nuesslein¹, Andreas Wolf¹, Arnaud Dochain², Xavier Urbain², and Holger Kreckel¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Institute of Condensed Matter and Nanoscience, Louvain-la-Neuve, Belgium

The significance of the triatomic hydrogen ion H₃⁺ for astrochemistry is well-established. It is a key contributor in a network of ion-neutral reactions that govern interstellar chemistry at low temperature and density. Additionally, as the simplest polyatomic molecule, H₃⁺ is an important benchmark system for theoretical calculations.

Due to a lack of a permanent dipole moment, laboratory spectroscopy of H₃⁺ remains a non-trivial endeavor. The highest-lying H₃⁺ levels experimentally reported have been identified by transitions from the H₃⁺ ground state to energies around 16500 cm⁻¹. Considering that the dissociation limit of H₃⁺ is at approximately 35000 cm⁻¹, more than half of the energetic landscape remains unexplored.

In this work, we discuss the possibility and requirements to extend H₃⁺ spectroscopy into the energy region above 20000 cm⁻¹. An approach for multi-color action spectroscopy is proposed to state-selectively investigate highly excited states of H₃⁺ in a cryogenic ion storage ring environment. We present model calculations describing the laser diagnostic schemes, based on a comprehensive H₃⁺ linelist.