Highly charged Ag-like and In-like ions for the development of atomic clocks and the search for α variation
Highly charged Ag-like and In-like ions for the development of atomic clocks and the search for α variation
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DOI：
10.1103/physreva.90.042513
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发表时间：
2014-07
影响因子：
2.9
通讯作者：
M. Safronova;V. Dzuba;V. Flambaum;U. Safronova;S. Porsev;M. Kozlov
中科院分区：
文献类型：
--
作者：
M. Safronova;V. Dzuba;V. Flambaum;U. Safronova;S. Porsev;M. Kozlov
我们对类银离子进行了详细的高精度研究，包括类银离子、类银离子、类银离子和类银离子。这些离子被确定为对发展超精密原子钟、寻找精细结构常数的变化和量子信息特别感兴趣[Safronova等人，Phys.莱特牧师。113,030801(2014年)]。类银离子的计算采用相对论线性化耦合团簇方法，类In离子的计算采用组态相互作用和耦合团簇方法相结合的混合方法。其中包括了Breit和QED修正。计算了能量、跃迁波长、电偶极、电四极、电八极、磁偶极、磁四极和磁八极简化的矩阵元、寿命和灵敏度系数。对各种贡献进行了详细研究，以评估最终结果的不确定度。在有实验值的情况下，计算了几个相似的“参照物”离子的能量，并与实验进行了比较，以进一步检验其准确性。
We carried out a detailed high-precision study of Ag-like ${\mathrm{Nd}}^{13+}$ and ${\mathrm{Sm}}^{15+}$ and In-like ${\mathrm{Ce}}^{9+}$, ${\mathrm{Pr}}^{10+}$, ${\mathrm{Nd}}^{11+}$, ${\mathrm{Sm}}^{13+}$, and ${\mathrm{Eu}}^{14+}$ highly charged ions. These ions were identified to be of particular interest for the development of ultra-accurate atomic clocks, the search for variation of the fine-structure constant $\ensuremath{\alpha}$, and quantum information [Safronova et al., Phys. Rev. Lett. 113, 030801 (2014)]. The relativistic linearized coupled-cluster method was used for Ag-like ion calculations, and a hybrid approach that combines configuration interaction and a variant of the coupled-cluster method was used for the In-like ion calculations. Breit and QED corrections were included. Energies, transition wavelengths, electric-dipole, electric-quadrupole, electric-octupole, magnetic-dipole, magnetic-quadrupole, and magnetic-octupole reduced matrix elements, lifetimes, and sensitivity coefficients to $\ensuremath{\alpha}$ variation were calculated. A detailed study of various contributions was carried out to evaluate uncertainties of the final results. Energies for several similar ``reference'' ions where the experimental values are available were calculated and compared with experiment for further tests of the accuracy.