Hyperfine energy levels of alkali-metal dimers: Ground-state polar molecules in electric and magnetic fields
Hyperfine energy levels of alkali-metal dimers: Ground-state polar molecules in electric and magnetic fields
复制标题
碱金属二聚体的超精细能级：电场和磁场中的基态极性分子
DOI：
10.1103/physreva.78.033434
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发表时间：
2008
影响因子：
2.9
通讯作者：
J. Hutson
中科院分区：
文献类型：
--
作者：
J. Aldegunde;Ben A. Rivington;P. Żuchowski;J. Hutson
我们研究了与基态电子态的最低旋转能级相关的异质碱金属二聚体的能级，这对于产生基态超冷分子的努力是很重要的。我们用密度泛函理论计算了KRb和RbCs的核四极矩和磁耦合常数，并探讨了在电场和磁场存在下的超精细结构。对于非旋转态，零场分裂主要由电子介导的核自旋-自旋耦合部分决定。KRb同位素的频率为几千赫兹，RbCs同位素的频率为几十千赫。
We investigate the energy levels of heteronuclear alkali-metal dimers in levels correlating with the lowest rotational level of the ground electronic state, which are important in efforts to produce ground-state ultracold molecules. We use density-functional theory to calculate nuclear quadrupole and magnetic coupling constants for KRb and RbCs and explore the hyperfine structure in the presence of electric and magnetic fields. For nonrotating states, the zero-field splittings are dominated by the electron-mediated part of the nuclear spin-spin coupling. They are a few kilohertz for KRb isotopologs and a few tens of kilohertz for RbCs isotopologs.