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Yuan X, Guo HJ, Wang YM, Xue JL, Xu HF, Yan B. Laser-cooling with an intermediate electronic state: Theoretical prediction on bismuth hydride. J Chem Phys 2019; 150:224305. [PMID: 31202252 DOI: 10.1063/1.5094367] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The possibility of laser cooling of bismuth hydride (BiH) molecules has been investigated based on high-level ab initio calculations by considering the core-valence and the spin-orbit coupling (SOC) effects. The potential energy curves of the 12 Λ-S states as well as the 25 Ω states that split from them via SOC are obtained by multireference configuration interaction plus the Davidson correction. The properties of b-X transition are investigated. Based on our calculations, we show that the transition between Ω states b0+-X10+ of BiH is a possible candidate for laser cooling, with consideration of the intermediate Ω state X21. An optical cycling scheme is proposed by utilizing four lasers at wavelengths around 471 and 601 nm with 5400 cycles for photon absorption/emission and a sub-microkelvin temperature. Our study should shed some light on searching for possible molecular candidates for laser cooling with the existence of an intermediate electronic state.
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Affiliation(s)
- Xiang Yuan
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Hui-Jie Guo
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Yu-Min Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Jian-Lei Xue
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Hai-Feng Xu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Bing Yan
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
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Yuan X, Yin S, Shen Y, Liu Y, Lian Y, Xu HF, Yan B. Laser cooling of thallium chloride: A theoretical investigation. J Chem Phys 2018; 149:094306. [DOI: 10.1063/1.5044387] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Xiang Yuan
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
| | - Shuang Yin
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
| | - Yong Shen
- Department of Physics, National University of Defense Technology, Changsha 410073, China
| | - Yong Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
| | - Yi Lian
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
| | - Hai-Feng Xu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
| | - Bing Yan
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University, Changchun 130012, China
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