Preparation of Ultracold Li+ Ions by Sympathetic Cooling in a Linear Paul Trap
CHEN Ting1,2,3, DU Li-Jun1,2,3, SONG Hong-Fang1,2,3, LIU Pei-Liang1,2, HUANG Yao1,2, TONG Xin1,2, GUAN Hua1,2**, GAO Ke-Lin1,2
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 2Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 3University of Chinese Academy of Sciences, Beijing 100190
Abstract：The 7Li+ ion is one of the most important candidates for verifying QED theory and obtaining the precise value of the fine-structure constant α. However, direct laser cooling of trapped Li+ ions will lead to strong background fluorescence which will influence the spectrum detection. The sympathetic cooling technique is a good choice to solve the problem. In this work, we report sympathetic cooling of 7Li+ ions to few mK using 40Ca+ ions in a linear Paul trap. A mixed ion crystal of 40Ca+ ions and 7Li+ ions are obtained. We also analyze the motion frequency spectra of pure 40Ca+ ions and mixed ions.
. [J]. 中国物理快报, 2015, 32(08): 83701-083701.
CHEN Ting, DU Li-Jun, SONG Hong-Fang, LIU Pei-Liang, HUANG Yao, TONG Xin, GUAN Hua, GAO Ke-Lin. Preparation of Ultracold Li+ Ions by Sympathetic Cooling in a Linear Paul Trap. Chin. Phys. Lett., 2015, 32(08): 83701-083701.
2015, Vol. 32 
