| ATOMIC AND MOLECULAR PHYSICS |
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Energy Levels and Transition Rates for Laser Cooling Os$^{-}$ and a General Approach to Produce Cold Atoms and Molecules |
| Yuzhu Lu1, Rui Zhang1, Changxian Song2, Chongyang Chen2, Ran Si2*, and Chuangang Ning1,3* |
1Department of Physics, State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
2Shanghai EBIT Lab, Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE), Institute of Modern Physics, Department of Nuclear Science and Technology, Fudan University, Shanghai 200433, China
3Frontier Science Center for Quantum Information, Tsinghua University, Beijing 100084, China
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| Cite this article: |
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Yuzhu Lu, Rui Zhang, Changxian Song et al 2023 Chin. Phys. Lett. 40 093101 |
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Abstract High-resolution photoelectron energy spectra of osmium anions are obtained using the slow-electron velocity-map imaging method. The energy levels of excited states $^{4}\!F_{7/2}$, $^{4}\!F_{5/2}$ and $^{4}\!F_{3/2}$ of Os$^{-}$ are determined to be 148.730(13), 155.69(15), and 176.76(13) THz [or 4961.09(41), 5193.4(49), and 5896.1(42) cm$^{-1}$], respectively. The lifetime of the opposite-parity excited state $^{6}\!D_{9/2}^{\rm o}$ is determined to be 201(10) µs using a cold ion trap, about 15 times shorter than the previous result 3(1) ms. Our high-level multi-configuration Dirac–Hartree–Fock calculations yield a theoretical lifetime 527 µs. Our work shows that the laser cooling rate of Os$^{-}$ is as fast as that of Th$^{-}$. The advantages of Os$^{-}$ are its near-IR range cooling transition and simple electronic structure, which make Os$^{-}$ a promising candidate for laser cooling of negative ions. We propose a general approach to produce cold atoms and molecules based on the sympathetic cooling of negative ions in combination with a threshold photodetachment.
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Received: 25 May 2023
Published: 30 August 2023
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| PACS: |
32.80.Gc
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(Photodetachment of atomic negative ions)
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31.15.am
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(Relativistic configuration interaction (CI) and many-body perturbation calculations)
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32.70.Cs
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(Oscillator strengths, lifetimes, transition moments)
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37.10.Rs
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(Ion cooling)
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