Investigation of spatial structure and sympathetic cooling in the 9Be+–40Ca+ bi-component Coulomb crystals

doi:10.1088/1674-1056/ac70b2

中国物理B ›› 2023, Vol. 32 ›› Issue (3): 36402-036402.doi: 10.1088/1674-1056/ac70b2

Investigation of spatial structure and sympathetic cooling in the ⁹Be⁺–⁴⁰Ca⁺ bi-component Coulomb crystals

Min Li(李敏)^1,2, Yong Zhang(张勇)^1,2, Qian-Yu Zhang(张乾煜)^1,2, Wen-Li Bai(白文丽)^1,2, Sheng-Guo He(何胜国)¹, Wen-Cui Peng(彭文翠)^1,‡, and Xin Tong(童昕)^1,†

1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2022-03-03 修回日期:2022-05-08 接受日期:2022-05-18 出版日期:2023-02-14 发布日期:2023-02-14
通讯作者: Xin Tong, Wen-Cui Peng E-mail:tongxin@wipm.ac.cn;wencuipeng@wipm.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 91636216), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21020200).

Investigation of spatial structure and sympathetic cooling in the ⁹Be⁺–⁴⁰Ca⁺ bi-component Coulomb crystals

Min Li(李敏)^1,2, Yong Zhang(张勇)^1,2, Qian-Yu Zhang(张乾煜)^1,2, Wen-Li Bai(白文丽)^1,2, Sheng-Guo He(何胜国)¹, Wen-Cui Peng(彭文翠)^1,‡, and Xin Tong(童昕)^1,†

1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2022-03-03 Revised:2022-05-08 Accepted:2022-05-18 Online:2023-02-14 Published:2023-02-14
Contact: Xin Tong, Wen-Cui Peng E-mail:tongxin@wipm.ac.cn;wencuipeng@wipm.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 91636216), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21020200).

摘要/Abstract

摘要： We study the spatial structure and sympathetic cooling of the bi-component Coulomb crystal (CC), which consists of approximate 450 ⁹Be⁺ ions and 450 ⁴⁰Ca⁺ ions with a mass ratio of 0.225 in a segmented linear ion trap. By two-dimensional imaging of the bi-component CC, the ⁹Be⁺ ions are found to be surrounded by the ⁴⁰Ca⁺ ions in the radial direction with a separation ratio of ～ 2.0, and the axial length of the ⁹Be⁺ ions occupied area is much larger than that of the ⁴⁰Ca⁺ ions occupied area. Combined with the previous experimental results, the structure of the ⁹Be⁺-⁴⁰Ca⁺ CC shows the larger the difference in the mass-charge ratio, the larger the separation between the two species. The comparison of the fluorescence spectra of the ⁹Be⁺ ions in the bi-component CC and the pure CC indicates that the ⁹Be⁺ ions can be sympathetically cooled and stably localized by the laser-cooled ⁴⁰Ca⁺ ions during the recording of the fluorescence spectrum.

关键词: Coulomb crystals, sympathetic cooling, fluorescence spectrum

Abstract: We study the spatial structure and sympathetic cooling of the bi-component Coulomb crystal (CC), which consists of approximate 450 ⁹Be⁺ ions and 450 ⁴⁰Ca⁺ ions with a mass ratio of 0.225 in a segmented linear ion trap. By two-dimensional imaging of the bi-component CC, the ⁹Be⁺ ions are found to be surrounded by the ⁴⁰Ca⁺ ions in the radial direction with a separation ratio of ～ 2.0, and the axial length of the ⁹Be⁺ ions occupied area is much larger than that of the ⁴⁰Ca⁺ ions occupied area. Combined with the previous experimental results, the structure of the ⁹Be⁺-⁴⁰Ca⁺ CC shows the larger the difference in the mass-charge ratio, the larger the separation between the two species. The comparison of the fluorescence spectra of the ⁹Be⁺ ions in the bi-component CC and the pure CC indicates that the ⁹Be⁺ ions can be sympathetically cooled and stably localized by the laser-cooled ⁴⁰Ca⁺ ions during the recording of the fluorescence spectrum.

Key words: Coulomb crystals, sympathetic cooling, fluorescence spectrum

中图分类号: (Ionic crystals)

64.70.kp

37.10.Rs (Ion cooling) 33.50.Dq (Fluorescence and phosphorescence spectra)

Min Li(李敏), Yong Zhang(张勇), Qian-Yu Zhang(张乾煜), Wen-Li Bai(白文丽), Sheng-Guo He(何胜国), Wen-Cui Peng(彭文翠), and Xin Tong(童昕). Investigation of spatial structure and sympathetic cooling in the ⁹Be⁺–⁴⁰Ca⁺ bi-component Coulomb crystals[J]. 中国物理B, 2023, 32(3): 36402-036402.

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Investigation of spatial structure and sympathetic cooling in the ⁹Be⁺–⁴⁰Ca⁺ bi-component Coulomb crystals

Investigation of spatial structure and sympathetic cooling in the ⁹Be⁺–⁴⁰Ca⁺ bi-component Coulomb crystals

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