We present accurate values of the atomic properties that are sensitive to an external electric field in an experiment, such as static electric dipole and quadrupole polarizabilities, hyperpolarizabilities, and quadrupole moments of the low-lying $5s^2{}^{1}S_0$, $5s5p{}^{3}P_{0,1,2}$, and $5s5p{}^{1}P_1$ states of the Cd atom. The four-component relativistic coupled-cluster theory is employed to determine the atomic wave functions and energies. The finite-field approach is adopted to estimate the above quantities from the evaluated energies. The roles of electron correlation effects in the calculations are demonstrated by giving results that are obtained with different approximations. Precise knowledge of the above spectroscopic properties is useful for estimating typical systematics of the optical clocks built using the Cd atoms.

中文翻译：

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原子钟应用中Cd原子的电偶极和四极性质

我们提供了在实验中对外部电场敏感的原子特性的准确值，例如静电偶极子和四极子的极化率，超极化率和低洼地的四极矩 $5s^2{}^{\mathrm{1个}}\mathrm{小号}_0$， $5s5p{}^{3}P_{0，\mathrm{1个}，2}$和 $5s5p{}^{\mathrm{1个}}P_{\mathrm{1个}}$Cd原子的状态。采用四成分相对论耦合聚类理论来确定原子波函数和能量。采用有限域方法从评估的能量中估计上述量。电子相关效应在计算中的作用通过给出以不同近似值获得的结果来证明。对上述光谱特性的准确了解对于估算使用Cd原子构建的光学时钟的典型系统非常有用。