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Freiburg 2024 – wissenschaftliches Programm

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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 Meijer11Fritz-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 4f7/2, 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

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