关键词: BD+离子/
组态相互作用方法/
光谱常数/
Doppler激光冷却
English Abstract
Theoretical investigation of laser cooling for BD+cation by ab inito calculation
Li Ya-Chao1,Meng Teng-Fei2,
Li Chuan-Liang1,
Qiu Xuan-Bing1,
He Xiao-Hu1,
Yang Wen1,
Guo Miao-Jun1,
Lai Yun-Zhong1,
Wei Ji-Lin1,
Zhao Yan-Ting2
1.School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China;
2.State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 11504256, U1610117, 61675120), the Open Fund of Key Laboratory of Time and Frequency Primary Standards and the Scientific, China, the State Key Laboratory of Precision Spectroscopy, China, Technological Innovation Programs of Higher Education Institutions in Shanxi, China (Grant No. 2015166), Jincheng's Programs for Science and Technology (Grant No. 1201501004-22), the OIT Program of Shanxi Province, China and the Project of Shanxi Scholarship Council of China (Grant No. 2016-096).Received Date:18 April 2017
Accepted Date:13 June 2017
Published Online:05 August 2017
Abstract:Based on consistent basis set aug-cc-pV5Z, five low-lying potential energy curves and transition dipole moments X2∑+, A2Π, B2∑+, a4Π and b4∑+ of BD+ are calculated by using internally contracted multi-reference configuration interaction approach. According to the calculation results, ro-vibrational levels of theses electronic states are derived through solving the radial Schrödinger equation ro-vibrational equation, and then the molecular parameters, Franck-Condon factors (FCFs) and radiation life are obtained by fitting and calculations. The FCFs (f00=0.923) and radiation life for v"=0 (τ=235 ns) of A2Π-X2∑+ are suitable for achieving rapid laser cooling. Therefore, an optical-cycle for Doppler laser cooling scheme is proposed:the system includes the A2Π1/2(v'=0)-X2∑+(v"=0, 1), where the case of v'=0 contains 2 rotational levels, the cases of v"=0 and v"=1 contain 6 and 4 rotational levels, respectively. According to the proposal, we simulate the dynamic process of the molecular population in laser cooling. The BD+ can be decelerated from initial velocity of 100 m/s to 4.6 m/s (13 mK) after scattering 1150 photons during 5.4 ms.
Keywords: BD+ cation/
MRCI/
spectroscopic parameters/
Doppler laser cooling
