Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
A 14.27: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Spectroscopy of the 3[11/2]11/2 state in Yb+ — •Mohamed Elshorbagy, Melina Filzinger, Martin Steinel, Jian Jiang, William Eckner, and Nils Huntemann — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig
The 2S1/2→2F7/2 electric octopole (E3) transition in Yb+, with its exceptionally long excited-state lifetime and strong sensitivity to the fine-structure constant α, has been used to set the most stringent limits on its variations [PRL 130, 253001 (2023)]. These limits were derived from frequency comparisons against the 2S1/2→2D3/2 transition of the same ion. The precision achieved in the comparisons was limited by the large quantum projection noise resulting from the 53 ms lifetime of the 2D3/2 state. A larger lifetime of several seconds is expected for the 3[11/2]11/2 state that can be excited with laser radiation at 1094 nm from the 2F7/2 state. We present the current status of our investigation and details of the corresponding probe laser system and interrogation sequence.
Keywords: trapped ions; optical coherence; coherent control