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MO: Fachverband Molekülphysik

MO 17: Poster: Cold Molecules

MO 17.12: Poster

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

Characterization of 4f¹³6s² hole states of ytterbium fluoride using resonant multiphoton ionization spectroscopy — •Luca Diaconescu¹, Stefan Popa², Sascha Schaller¹, André Fielicke¹, and Gerard Meijer¹ — ¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — ²Imperial College London, London, UK

The ionically bonded ytterbium monofluoride molecule YbF, used for measuring the electron’s electric dipole moment (eEDM), is capable of entering a Yb⁺[4f¹³6s²] “hole” configuration, defined by excitation of one of the inner 4f shell electrons of the constituent ytterbium ion into the outer shell. The electronic levels derived from this configuration, along with the ones derived from the “normal” Yb⁺[4f¹⁴6s¹] configuration, coexist within the molecule’s energy landscape. Using resonance enhanced multiphoton ionization spectroscopy (REMPI), we have rotationally characterized the low lying 4f_{7/2, 1/2}⁻¹ hole state for ν=0, 1. This knowledge will help improve laser cooling schemes for YbF, thus enabling more precise eEDM measurements. Furthermore, significant differences in the ionization behavior of YbF between the normal and the 4f hole configurations were observed and ionization energies for both configurations were determined.

Keywords: Diatomic Molecules; Lanthanides; Laser Spectroscopy; REMPI