Electronic bridge excitation in highly charged Th-229 ions

Abstract

The excitation of the 8 eV ${}^{229m}$Th isomer through the electronic bridge mechanism in highly charged ions is investigated theoretically. By exploiting the rich level scheme of open $4f$ orbitals and the robustness of highly charged ions against photoionization, a pulsed high-intensity optical laser can be used to efficiently drive the nuclear transition by coupling it to the electronic shell. We show how to implement a promising electronic bridge scheme in an electron beam ion trap starting from a metastable electronic state. This setup would avoid the need for a tunable vacuum ultraviolet laser. Based on our theoretical predictions, determining the isomer energy with an uncertainty of $10^{-5}$ eV could be achieved in one day of measurement time using realistic laser parameters.

arXiv comment6 pages, 4 figures

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• Expanding Nuclear Physics Horizons with the Gamma Factory
• Tunable VUV Frequency Comb for ${}^{229m}$Th Nuclear Spectroscopy
• Recollision induced nuclear excitation of ${}^{229}$Th
• Deep-learning approach for the atomic configuration interaction problem on large basis sets
• New Opportunities in Femto-to-Nanometer Scale with High-Intensity Lasers
• A scheme for excitation of thorium-229 nuclei based on the electronic bridge excitaion
• Excitation and probing of low-energy nuclear states at high-energy storage rings
• Pr10+ as a candidate for a high-accuracy optical clock for tests of fundamental physics
• Studies of thorium and ytterbium ion trap loading from laser ablation for gravity monitoring with nuclear clocks
• Proposal for a Nuclear Light Source
• Isomer depletion via nuclear excitation by inelastic electron scattering