Atomic properties of Cd-like and Sn-like ions for the development of frequency standards and search for the variation of the fine-structure constant
Atomic properties of Cd-like and Sn-like ions for the development of frequency standards and search for the variation of the fine-structure constant
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DOI：
10.1103/physreva.90.052509
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发表时间：
2014-09
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
采用组态相互作用和线性化耦合团簇方法，对类Cd的Nd ^{12+}$，Sm ^{14+}$和类Sn的Pr ^{9+}$，Nd ^{10+}$的原子性质进行了高精度的相对论计算.这些离子具有长寿命的亚稳态，可通过激光激发实现跃迁，相对简单的电子结构，对$\alpha$变化的高灵敏度，以及稳定的同位素。计算中包含了Breit和QED修正。能量，过渡波长，电和磁多极约化矩阵元素，寿命，和灵敏度系数$q$和$K$的精细结构常数$\alpha$的变化得到。对不确定性进行了详细研究。计算了类Cd Ba$^{8+}$，La$^{9+}$，Ce$^{10+}$，Pr$^{11+}$和类Sn Ba$^{6+}$离子的能量，并与实验进行了比较，以进一步检验其准确性。
A high-precision relativistic calculations of Cd-like Nd$^{12+}$, Sm$^{14+}$ and Sn-like Pr$^{9+}$, Nd$^{10+}$ atomic properties is carried out using an approach that combines configuration interaction and a linearized coupled-cluster method. These ions have long-lived metastable states with transitions accessible by laser excitations, relatively simple electronic structure, high sensitivity to $\alpha$ variation, and stable isotopes. Breit and QED corrections were included into the calculations. Energies, transition wavelengths, electric- and magnetic-multipole reduced matrix elements, lifetimes, and sensitivity coefficients $q$ and $K$ to the variation of the fine-structure constant $\alpha$ were obtained. A detailed study of uncertainties was performed. Energies for similar Cd-like Ba$^{8+}$, La$^{9+}$, Ce$^{10+}$, Pr$^{11+}$ and Sn-like Ba$^{6+}$ ions were calculated and compared with experiment for further tests of the accuracy.