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Explicitly correlated configuration interaction investigation on low-lying states of SiO+ and SiO |
Rui Li(李瑞)1,2, Gui-Ying Liang(梁桂颖)2, Xiao-He Lin(林晓贺)2, Yu-Hao Zhu(朱宇豪)2, Shu-Tao Zhao(赵书涛)3, Yong Wu(吴勇)2,4 |
1 Department of Physics, College of Science, Qiqihar University, Qiqihar 161006, China;
2 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
3 School of Physics and Electronic Science, Fuyang Normal University, Fuyang 236037, China;
4 HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100084, China |
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Abstract SiO+ and SiO, which play vital roles in astrophysics and astrochemistry, have long attracted considerable attention. However, accurate information about excited states of SiO+ is still limited. In this work, the structures of 14 Λ-S states and 30Ω states of SiO+ are computed with explicitly correlated configuration interaction method. On the basis of the calculated potential energy curves of those Λ-S states and Ω states, the spectroscopic constants of bound states are evaluated, which are in good agreement with the latest experimental results. The predissociation mechanism of B2Σ+ state is illuminated with the aid of spin-orbit coupling matrix elements. On the basis of the calculated potential energy curves and transition dipole moments, the radiative lifetime for each of low-lying vibrational states B2Σ+ and A2Π is estimated. The laser cooling scheme of SiO+ is proposed by employing B2Σ+-X2Σ+ transition. Finally, the vertical ionization energy values from SiO (X1Σ+) to ionic states:SiO+, X2Σ+, B2Σ+, and A2Π are calculated, which agree well with experimental measurements.
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Received: 12 December 2018
Revised: 29 January 2019
Accepted manuscript online:
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PACS:
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31.50.Df
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(Potential energy surfaces for excited electronic states)
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31.15.aj
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(Relativistic corrections, spin-orbit effects, fine structure; hyperfine structure)
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31.15.ag
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(Excitation energies and lifetimes; oscillator strengths)
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Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300), the Science Challenge Project (Grant No. TZ2016005), the China Postdoctoral Science Foundation (Grant No. 2018M631404), the National Natural Science Foundation of China (Grant No. 11404180), the University Nursing Program for Yong Scholars with Creative Talents in Heilongjiang Province, China (Grant No. UNPYSCT-2015095), the Natural Science Research Project of Education Department of Anhui Province, China (Grant No. KJ2018A0342), and the Key Program of Excellent Youth Talent Project of Fuyang Normal University, China (Grant No. rcxm201801). |
Corresponding Authors:
Rui Li, Yong Wu
E-mail: lirei01@163.com;wu_yong@iapcm.ac.cn
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Cite this article:
Rui Li(李瑞), Gui-Ying Liang(梁桂颖), Xiao-He Lin(林晓贺), Yu-Hao Zhu(朱宇豪), Shu-Tao Zhao(赵书涛), Yong Wu(吴勇) Explicitly correlated configuration interaction investigation on low-lying states of SiO+ and SiO 2019 Chin. Phys. B 28 043102
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