Freiburg 2024 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 17: Poster: Cold Molecules

MO 17.11: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent C

Ionization and Dissociation Energies of Dysprosium Monoxide — •Sascha Schaller, Johannes Seifert, Giacomo Valtolina, André Fielicke, Boris G. Sartakov, and Gerard Meijer — Fritz-Haber-Institut der Max-Planck-Gesellschaft

Previous reports for the ionization and dissociation energies of dysprosium monoxide are contradictory. Thermochemical studies and electron impact ionization led to estimates for IE and D₀ of DyO, but the values are associated with large uncertainties. Furthermore, a recent measurement of D₀(DyO⁺) implies ΔH₀ = +0.33(2) eV, however, this conflicts with the earlier reported values for IE and D₀ [1]. Here we report on the characterization DyO and DyO⁺ in a supersonic molecular beam by applying a variety of spectroscopic approaches using different REMPI and PFI schemes, MATI, and (V)UV single-photon ionization. Isotope specific excitation schemes allow to obtain rotationally resolved spectra, and several Rydberg-series converging to the ionization limits of different rotational states of DyO⁺. The Rydberg series can be clearly assigned starting with the lowest J=7.5 state. Beside these long-living Rydberg molecules, a number of short-lived molecular states are found. From the spectroscopic data obtained for the fermionic ¹⁶¹DyO and the bosonic ¹⁶²DyO, the values of IE and D₀ are determined with a high precision. This leads to the conclusion that the reaction Dy + O → DyO⁺ + e⁻ clearly proceeds exothermic.

[1] M. Ghiassee et al., J. Phys. Chem. A 127 (2023), 169

Keywords: Diatomic Molecules; Lanthanides; Laser Spectroscopy; REMPI; Rydberg molecules