摘要
We obtain bi-component Coulomb crystals using laser-cooled ^40Ca^+ ions to sympathetically cool ^9Be^+ ions in a linear Paul trap. The shell structures of the bi-component Coulomb crystals are investigated. The secular motion frequencies of the two different ions are determined and compared with those in the single-component Coulomb crystals. In the radial direction, the resonant motion frequencies of the two ionic species shift toward each other due to the strong motion coupling in the ion trap. In the axial direction, the motion frequency of the laser-cooled ^40Ca^+is impervious to the sympathetically cooled ^9Be^+ ions because the spatially separation of the two different ionic species leads to the weak motion coupling in the axial direction.
We obtain bi-component Coulomb crystals using laser-cooled 40Ca+ ions to sympathetically cool 9Be+ ions in a linear Paul trap. The shell structures of the bi-component Coulomb crystals are investigated. The secular motion frequencies of the two different ions are determined and compared with those in the single-component Coulomb crystals. In the radial direction, the resonant motion frequencies of the two ionic species shift toward each other due to the strong motion coupling in the ion trap. In the axial direction, the motion frequency of the laser-cooled40Ca+is impervious to the sympathetically cooled 9Be+ ions because the spatially separation of the two different ionic species leads to the weak motion coupling in the axial direction.
作者
Hai-Xia Li
Min Li
Qian-Yu Zhang
Xin Tong
李海霞;李敏;张乾煜;童昕(State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071;University of Chinese Academy of Sciences, Beijing 100049)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 91636216,11504410 and 11474317
the Strategic Priority Research Program(B) of the Chinese Academy of Sciences under Grant No XDB21020200
