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Wang ZW, Li ZA, Bai XH, Gong T, Ji ZH, Zhao YT, Wang GR. Analyzing the photoassociation spectrum of ultracold 85Rb 133Cs molecule in (3)3Σ+ state. J Chem Phys 2024; 160:114313. [PMID: 38501473 DOI: 10.1063/5.0182907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Accepted: 02/27/2024] [Indexed: 03/20/2024] Open
Abstract
We establish a theoretical model to analyze the photoassociative spectroscopy of 85Rb 133Cs molecules in the (3)3Σ+ state. The vibrational energy, spin-spin coupling constant, and hyperfine interaction constant of the (3)3Σ+ state are determined based on nine observed vibrational levels. Consequently, the Rydberg-Klein-Rees potential energy curve of the (3)3Σ+ state is obtained and compared with the ab initial potential energy curve. Our model can be adopted to analyze the photoassociative spectroscopy of other heteronuclear alkali-metal diatomic molecules in the (3)3Σ+ state.
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Affiliation(s)
- Zi-Wei Wang
- School of Physics, Dalian University of Technology, Dalian 116024, China
| | - Zi-Ang Li
- School of Physics, Dalian University of Technology, Dalian 116024, China
| | - Xu-Hui Bai
- School of Physics, Dalian University of Technology, Dalian 116024, China
| | - Ting Gong
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
| | - Zhong-Hua Ji
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
| | - Yan-Ting Zhao
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
| | - Gao-Ren Wang
- School of Physics, Dalian University of Technology, Dalian 116024, China
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Skripnikov LV, Oleynichenko AV, Zaitsevskii A, Mosyagin NS, Athanasakis-Kaklamanakis M, Au M, Neyens G. Ab initio study of electronic states and radiative properties of the AcF molecule. J Chem Phys 2023; 159:124301. [PMID: 38127371 DOI: 10.1063/5.0159888] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 09/01/2023] [Indexed: 12/23/2023] Open
Abstract
Relativistic coupled-cluster calculations of the ionization potential, dissociation energy, and excited electronic states under 35 000 cm-1 are presented for the actinium monofluoride (AcF) molecule. The ionization potential is calculated to be IPe = 48 866 cm-1, and the ground state is confirmed to be a closed-shell singlet and thus strongly sensitive to the T,P-violating nuclear Schiff moment of the Ac nucleus. Radiative properties and transition dipole moments from the ground state are identified for several excited states, achieving a mean uncertainty estimate of ∼450 cm-1 for the excitation energies. For higher-lying states that are not directly accessible from the ground state, possible two-step excitation pathways are proposed. The calculated branching ratios and Franck-Condon factors are used to investigate the suitability of AcF for direct laser cooling. The lifetime of the metastable (1)3Δ1 state, which can be used in experimental searches of the electric dipole moment of the electron, is estimated to be of order 1 ms.
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Affiliation(s)
- Leonid V Skripnikov
- Petersburg Nuclear Physics Institute named by B. P. Konstantinov of National Research Center "Kurchatov Institute" (NRC "Kurchatov Institute" - PNPI), 1 Orlova roscha, Gatchina, 188300 Leningrad region, Russia
- Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Alexander V Oleynichenko
- Petersburg Nuclear Physics Institute named by B. P. Konstantinov of National Research Center "Kurchatov Institute" (NRC "Kurchatov Institute" - PNPI), 1 Orlova roscha, Gatchina, 188300 Leningrad region, Russia
| | - Andréi Zaitsevskii
- Petersburg Nuclear Physics Institute named by B. P. Konstantinov of National Research Center "Kurchatov Institute" (NRC "Kurchatov Institute" - PNPI), 1 Orlova roscha, Gatchina, 188300 Leningrad region, Russia
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie gory 1/3, Moscow 119991, Russia
| | - Nikolai S Mosyagin
- Petersburg Nuclear Physics Institute named by B. P. Konstantinov of National Research Center "Kurchatov Institute" (NRC "Kurchatov Institute" - PNPI), 1 Orlova roscha, Gatchina, 188300 Leningrad region, Russia
| | - Michail Athanasakis-Kaklamanakis
- Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
| | - Mia Au
- Systems Department, CERN, CH-1211 Geneva 23, Switzerland
| | - Gerda Neyens
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
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Zaitsevskii A, Skripnikov LV, Mosyagin NS, Isaev T, Berger R, Breier AA, Giesen TF. Accurate ab initio calculations of RaF electronic structure appeal to more laser-spectroscopical measurements. J Chem Phys 2022; 156:044306. [PMID: 35105071 DOI: 10.1063/5.0079618] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Recently, a breakthrough has been achieved in laser-spectroscopic studies of short-lived radioactive compounds with the first measurements of the radium monofluoride molecule (RaF) UV/vis spectra. We report results from high-accuracy ab initio calculations of the RaF electronic structure for ground and low-lying excited electronic states. Two different methods agree excellently with experimental excitation energies from the electronic ground state to the 2Π1/2 and 2Π3/2 states, but lead consistently and unambiguously to deviations from experimental-based adiabatic transition energy estimates for the 2Σ1/2 excited electronic state, and show that more measurements are needed to clarify spectroscopic assignment of the 2Δ state.
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Affiliation(s)
- Andrei Zaitsevskii
- NRC "Kurchatov Institute"-PNPI, Orlova Roscha, 1, 188300 Gatchina, Russia
| | | | - Nikolai S Mosyagin
- NRC "Kurchatov Institute"-PNPI, Orlova Roscha, 1, 188300 Gatchina, Russia
| | - Timur Isaev
- NRC "Kurchatov Institute"-PNPI, Orlova Roscha, 1, 188300 Gatchina, Russia
| | - Robert Berger
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Str 4, 35032 Marburg, Germany
| | - Alexander A Breier
- Laboratory for Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany
| | - Thomas F Giesen
- Laboratory for Astrophysics, Institute of Physics, University of Kassel, 34132 Kassel, Germany
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Ab initio study of R-dependent behavior of the hyperfine structure parameters for the (1)1,3Σ+ states of LiRb and LiCs. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137998] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Finite-Field Calculations of Transition Properties by the Fock Space Relativistic Coupled Cluster Method: Transitions between Different Fock Space Sectors. Symmetry (Basel) 2020. [DOI: 10.3390/sym12111845] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Reliable information on transition matrix elements of various property operators between molecular electronic states is of crucial importance for predicting spectroscopic, electric, magnetic and radiative properties of molecules. The finite-field technique is a simple and rather accurate tool for evaluating transition matrix elements of first-order properties in the frames of the Fock space relativistic coupled cluster approach. We formulate and discuss the extension of this technique to the case of transitions between the electronic states associated with different sectors of the Fock space. Pilot applications to the evaluation of transition dipole moments between the closed-shell-like states (vacuum sector) and those dominated by single excitations of the Fermi vacuum (the 1h1p sector) in heavy atoms (Xe and Hg) and simple molecules of heavy element compounds (I2 and TlF) are reported.
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