Spectroscopic properties of the low-lying electronic states and laser cooling feasibility for the SrI molecule |
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| Institution: | 1. School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, PRChina;2. Hunan Key Laboratory for High-Microstructure and Ultrafast Process, College of Physics and Electronics, Central South University, Changsha 410083, PR China;1. National University of Computer and Emerging Sciences, Islamabad, Chiniot-Faisalabad Campus, Pakistan;2. National University of Computer and Emerging Sciences, Islamabad, Lahore Campus, Pakistan;3. Department of Mathematics, Shanghai University, Shanghai, Shanghai, 200444, People’s Republic of China;1. Department of Mathematics, Quaid-i-Azam University, Islamabad 44000, Pakistan;2. Department of Mathematical Sciences Federal Urdu University of Arts, Sciences & Technology, Islamabad 44000, Pakistan;1. Department of Applied Mathematics, Northwestern Polytechnical University, Xian, 710072, China;2. Department of Mathematics, GITAM Bengaluru, Karnataka, 562163, India;3. School of Energy and Power, Xian Jiaotong University, No. 28, Xianning West Road, Xian 710049, China;4. School of Aerospace and Mechanical Engineering, Nanyang Technological University, Singapore;5. Department of Mathematics, Government College University Faislabad, Punjab, Pakistan |
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| Abstract: | Laser cooling of a molecule with heavy nuclei is often complicated because of the density distribution of the electronic states. Here, we evaluate the feasibility of the laser cooling of the SrI molecule by calculating the potential energy curves and transition dipole moments of the ground and low-lying excited states using the multi-reference configuration interaction plus Davidson corrections (MRCI + Q) and the all-electron basis sets of ANO-RCC. The relativistic effect and the spin-orbit coupling splits are included, because both Sr and I are heavy atoms. Based on the obtained potential energy curves, we solve the Schrödinger equation of nuclear motion to determine the rovibrational energy levels and the Franck-Condon factors. The spectroscopic parameters are obtained by fitting the rovibrational energy levels with the Dunham expression. The radiation lifetimes, the Doppler and recoil temperatures between the X2Σ+ and the 2Π1/2/2Π3/2/B2Σ+ states are calculated. 5-color laser cooling schemes for the molecule are proposed, which can lead to the total effective Franck-Condon factors being 0.99983, 0.99979, and 0.99941 for the three transitions, respectively. All the obtained results suggest that the SrI molecule is a feasible candidate for laser cooling. |
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