Highly charged ion (HCI) clocks: Frontier candidates for testing variation of fine-structure constant
Highly charged ion (HCI) clocks: Frontier candidates for testing variation of fine-structure constant
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高电荷离子 (HCI) 时钟：测试精细结构常数变化的前沿候选者
DOI：
10.3389/fphy.2023.1104848
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发表时间：
2022-11
影响因子：
3.1
通讯作者：
BingBing Suo
中科院分区：
文献类型：
--
作者：
Yanmei Yu;B. K. Sahoo;BingBing Suo
人们试图把引力与其他三种基本自然力统一起来。正如高维模型所建议的那样，这种统一可能需要某些无量纲基本常数的空间和时间变化。在这种情况下，在宇宙学时间尺度上探测低能区电磁精细结构常数（α e ~ 2·Zc）随时间的变化具有重要意义。原子钟是探测α变化的理想候选者，因为它们的跃迁频率是以超高精度测量的。由于原子跃迁频率是α的函数，因此在不同的时间和空间位置测量时钟频率可以产生确定α变化的特征。高电荷态离子（HCI）对α的变化非常敏感，受外界扰动的影响最小，是研究α随时间变化的理想平台。在这项工作中，我们概述了适合于建立原子钟的HCI，因为它们的光谱特性和对α变化的敏感性。通过分析元素周期表中一系列等电子原子系统沿着精细结构分裂和能级交叉模式的趋势，根据两条一般规则，概述了HCI时钟候选者的选择。本文采用组态相互作用和耦合团簇理论框架下的相对论多体方法的两种变体来确定拟用于原子钟的HCI的性质。这些方法严格地在狄拉克-库仑哈密顿量框架下处理电子关联和相对论效应，而近似地包含了其他高阶相对论效应。利用计算的原子性质讨论了HCI时钟频率测量的典型系统效应。这篇综述将有助于理解所提出的HCI作为未来原子钟候选者的局限性和潜力。and.guide
Attempts are made to unify gravity with the other three fundamental forces of nature..As suggested by higher dimensional models, this unification may require space and.time variation of some of the dimensionless fundamental constants. In this scenario,.probing temporal variation of the electromagnetic fine structure constant (α e2.Zc) in.a low energy regime at the cosmological time scale is of immense interest. Atomic.clocks are ideal candidates for probing α variation because their transition.frequencies are measured with ultra-high precision. Since atomic transition.frequency is a function of α, measurement of a clock frequency at different.temporal and spatial locations can yield signatures to ascertain variation of α..Highly charged ions (HCIs) are very sensitive to variation of α and are least.affected by external perturbations, making them excellent platforms for searching.for temporal variation of α. In this work, we overview HCIs suitable for building atomic.clocks because of their spectroscopic features and sensitivity to variation of α. The.selection of HCI clock candidates is outlined based on two general rules—by.analyzing trends in fine structure splitting and level-crossing patterns along a.series of isoelectronic atomic systems of the periodic table. Two variants of.relativistic many-body methods in the configuration interaction and coupledcluster.theory frameworks are employed to determine the properties of HCIs.proposed for atomic clocks. These methods treat electronic correlation and.relativistic effects under the frame of the Dirac-Coulomb Hamiltonian rigorously,.while other higher-order relativistic effects are included approximately. Typical.systematic effects of the HCI clock frequency measurements are discussed using.the calculated atomic properties. This review will help understand limits and.potentials of the proposed HCIs as the prospective atomic clock candidates and.guide future HCI clock experiments.
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影响因子：
64.8
作者：
S. King;L. J. Spiess;P. Micke;A. Wilzewski;T. Leopold;E. Benkler;R. Lange;N. Huntemann;A. Surzhykov;V. Yerokhin;José R. Crespo López-Urrutia;P. O. Schmidt
通讯作者：
S. King;L. J. Spiess;P. Micke;A. Wilzewski;T. Leopold;E. Benkler;R. Lange;N. Huntemann;A. Surzhykov;V. Yerokhin;José R. Crespo López-Urrutia;P. O. Schmidt
26 类K离子D-2态精细结构分裂禁戒跃迁性质的理论研究
影响因子：
1.7
作者：
Liu Jian-Peng;Li Cheng-Bin;Zou Hong-Xin
通讯作者：
Zou Hong-Xin
DOI：
10.1016/0168-583x(87)90460-5
发表时间：
1987-04
影响因子：
1.3
作者：
É. Biémont;J. E. Hansen
通讯作者：
É. Biémont;J. E. Hansen
DOI：
10.21203/rs.3.rs-333884/v1
发表时间：
2021-03
期刊：
arXiv: Atomic Physics
影响因子：
--
作者：
Yao Huang;Baolin Zhang;Mengyan Zeng;Yanmei Hao;Huaqing Zhang;H. Guan;Zheng Chen;Miao Wang;K. Gao
通讯作者：
Yao Huang;Baolin Zhang;Mengyan Zeng;Yanmei Hao;Huaqing Zhang;H. Guan;Zheng Chen;Miao Wang;K. Gao
影响因子：
8.6
作者：
N. Leefer;Carsten Weber;A. Cingöz;J. Torgerson;D. Budker;D. Budker
通讯作者：
N. Leefer;Carsten Weber;A. Cingöz;J. Torgerson;D. Budker;D. Budker