Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions
Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions
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DOI：
10.1038/s42005-023-01127-x
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发表时间：
2022-07
影响因子：
5.5
通讯作者：
N. Kimura;Priti;Yasutaka Kono;Pativate Pipatpakorn;Keigo Soutome;Naoki Numadate;S. Kuma;T. Azuma;N. Nakamura
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文献类型：
--
作者：
N. Kimura;Priti;Yasutaka Kono;Pativate Pipatpakorn;Keigo Soutome;Naoki Numadate;S. Kuma;T. Azuma;N. Nakamura
高电荷态离子（HCI）的超精细结构是探索基础物理沿着核性质的有利光谱目标。最近提出的HCI原子钟突出了它们的重要性，特别是对于多电子HCI，并且它们已经通过细化原子结构计算进行了理论研究。然而，由于实验困难，多电子HCI的超精细光谱学的发展没有进行。在这里，我们展示了超精细结构分辨激光光谱的HCI在电子束离子阱等离子体，采用磁偶极子跃迁的4d95s状态的127I7+。离子状态操纵控制电子碰撞在定义良好的实验室等离子体中，使激光诱导荧光光谱的捕获HCl。在低磁场下蒸发冷却离子的观测光谱显示出反映超精细结构的特征。目前的演示使用相结合的光学和等离子体的方法提供了一个基准的最先进的原子计算的超精细结构在多电子HCI，并提供了各种未开发的实验的可能性。
Hyperfine structures of highly charged ions (HCIs) are favourable spectroscopic targets for exploring fundamental physics along with nuclear properties. Recent proposals of HCI atomic clocks highlight their importance, especially for many-electron HCIs, and they have been theoretically investigated by refining atomic-structure calculations. However, developments in hyperfine spectroscopy of many-electron HCIs have not proceeded due to experimental difficulty. Here, we demonstrate hyperfine-structure-resolved laser spectroscopy of HCIs in an electron beam ion trap plasma, employing the magnetic-dipole transition in the 4d95sstate of127I7+. Ion-state manipulation by controlled electron collisions in the well-defined laboratory plasma enables laser-induced fluorescence spectroscopy of trapped HCIs. The observed spectrum of evaporatively cooled ions under low magnetic fields shows characteristic features reflecting the hyperfine structures. The present demonstration using combined optical and plasma approaches provides a benchmark for state-of-the-art atomic calculations of hyperfine structures in many-electron HCIs, and offers possibilities for a variety of unexploited experiments.