Candidate for Laser Cooling of a Negative Ion: High-Resolution Photoelectron Imaging of Th-
Candidate for Laser Cooling of a Negative Ion: High-Resolution Photoelectron Imaging of Th-
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负离子激光冷却的候选者：Th-的高分辨率光电子成像
DOI：
10.1103/physrevlett.123.203002
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发表时间：
2019
影响因子：
8.6
通讯作者：
Ning Chuangang
中科院分区：
文献类型：
--
作者：
Tang Rulin;Si Ran;Fei Zejie;Fu Xiaoxi;Lu Yuzhu;Brage Tomas;Liu Hongtao;Chen Chongyang;Ning Chuangang
激光冷却是一种用于产生超冷中性原子或正离子系综的成熟技术。在过去的40年里，这种能力开辟了许多令人兴奋的新研究领域。然而，没有带负电荷的离子被直接激光冷却，因为在原子阴离子中循环跃迁非常罕见。经过十多年的努力，目前已经找到了最有希望的候选人。我们报告了支持作为激光冷却新的有前途的候选者的实验和理论研究。Th的电子亲合势的测量值和计算值分别为0.607 690（60）和0.599 eV，几乎是以前的理论值0.368 eV的2倍。的基态决定要比。其结果是，有几个强烈的电偶极跃迁之间的束缚能级所产生的配置和英寸。潜在的激光冷却转变的波长是。零核自旋和由此产生的超精细结构的缺乏减少了在激光冷却中遇到的潜在的复杂性，使一个新的和令人兴奋的候选激光冷却。
Laser cooling is a well-established technique for the creation of ensembles of ultracold neutral atoms or positive ions. This ability has opened many exciting new research fields over the past 40 years. However, no negatively charged ions have been directly laser cooled because a cycling transition is very rare in atomic anions. Efforts of more than a decade currently haveas the most promising candidate. We report on experimental and theoretical studies supportingas a new promising candidate for laser cooling. The measured and calculated electron affinities of Th are, respectively,and, or 0.607 690(60) and 0.599 eV, almost a factor of 2 larger than the previous theoretical value of 0.368 eV. The ground state ofis determined to berather than. The consequence of this is that there are several strong electric dipole transitions between the bound levels arising from configurationsandin. The potential laser-cooling transition iswith a wavelength of. The zero nuclear spin and hence lack of hyperfine structure inreduces the potential complications in laser cooling as encountered in, makinga new and exciting candidate for laser cooling.