Prediction of Ig,6d3/2 → Ig,7p1/2, Ig,7s1/2 → Ig,7p1/2 and Ig, 7p1/2 → Im,7s1/2 transition frequencies in 229Th3+ ion

doi:10.1088/1674-1056/ae0016

Abstract The $^{229}$Th nucleus has attracted considerable attention due to the existence of its low-energy isomeric state; however, direct laser excitation in ionic systems poses significant challenges for current laser technologies. In the $^{229}$Th$^{3+}$ ion, the electronic bridge (EB) process enables the conversion of direct laser excitation into an effective two-photon process ($I_{\rm g},6{\rm d}_{3/2}\rightarrow I_{\rm g},7{\rm p}_{1/2}\rightarrow I_{\rm m},7{\rm s}_{1/2}$), thereby circumventing the requirement for laser radiation at 148 nm. In this work, we employ many-body perturbation theory (MBPT) to calculate the hyperfine structure constants and field shift factors for several low-lying excited states of the $^{229}$Th$^{3+}$ ion. By combining these theoretical results with previously reported experimental data, we predict three transition frequencies associated with the EB process in the $^{229}$Th$^{3+}$ ion and identify the most suitable transition pathway for EB-assisted nuclear excitation.

Keywords: thorium nuclear clock electronic bridge process nuclear hyperfine mixing

Received: 26 May 2025
Revised: 14 August 2025
Accepted manuscript online: 28 August 2025

PACS:	37.10.Vz	(Mechanical effects of light on atoms, molecules, and ions)
	31.15.-p	(Calculations and mathematical techniques in atomic and molecular physics)
	31.15.am	(Relativistic configuration interaction (CI) and many-body perturbation calculations)
	31.30.Gs	(Hyperfine interactions and isotope effects)

Fund: This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB0920403) and the National Key Research and Development Program of China (Grant No. 2022YFB3904002).

Corresponding Authors: Cheng-Bin Li, Lei She
E-mail: cbli@apm.ac.cn;shelei@apm.ac.cn

Cite this article:

Shi-Cheng Yu(余师成), Cheng-Bin Li(李承斌), and Lei She(佘磊) Prediction of I_g,6d_3/2 → I_g,7p_1/2, I_g,7s_1/2 → I_g,7p_1/2 and I_g, 7p_1/2 → I_m,7s_1/2 transition frequencies in ²²⁹Th³⁺ ion 2026 Chin. Phys. B 35 023701

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Prediction of I_g,6d_3/2 → I_g,7p_1/2, I_g,7s_1/2 → I_g,7p_1/2 and I_g, 7p_1/2 → I_m,7s_1/2 transition frequencies in ²²⁹Th³⁺ ion

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