Candidate for Laser Cooling of a Negative Ion: High-Resolution Photoelectron Imaging of Th-
文献类型：期刊论文
| 作者 | Tang, RL; Si, R; Fei, ZJ; Fu, XX; Lu, YZ; Brage, T; Liu, HT; Chen, CY; Ning, CG |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2019 |
| 卷号 | 123期号:20页码:- |
| 关键词 | ELECTRON-AFFINITY TRANSITION QUANTUM ATOMS |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.123.203002 |
| 文献子类 | 期刊论文 |
| 英文摘要 | 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 have La- as the most promising candidate. We report on experimental and theoretical studies supporting Th- as a new promising candidate for laser cooling. The measured and calculated electron affinities of Th are, respectively, 4901.35(48) cm(-1) and 4832 cm(-1), 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 of Th- is determined to be 6d(3)7s(2) F-4(3/2)e rather than 6d(2)7s(2)7p (4)G(5/2)(o). The consequence of this is that there are several strong electric dipole transitions between the bound levels arising from configurations 6d(3)7s(2) and 6d(3)7s(2)7p in Th-. The potential laser-cooling transition is S-2(1/2)o <-> F-4(3/2)e with a wavelength of 2.6 mu m. The zero nuclear spin and hence lack of hyperfine structure in Th- reduces the potential complications in laser cooling as encountered in La(- )making Th- a new and exciting candidate for laser cooling. |
| 语种 | 英语 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/31985]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2011-2017年 |
| 作者单位 | 1.Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China 2.Lund Univ, Dept Phys, POB 118, S-22100 Lund, Sweden; 3.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China; 4.Fudan Univ, Shanghai EBIT Lab, Key Lab Nucl Phys & Ion Beam Applicat MOE, Inst Modern Phys,Dept Nucl Sci & Technol, Shanghai 200433, Peoples R China; 5.Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Tang, RL,Si, R,Fei, ZJ,et al. Candidate for Laser Cooling of a Negative Ion: High-Resolution Photoelectron Imaging of Th-[J]. PHYSICAL REVIEW LETTERS,2019,123(20):-. |
| APA | Tang, RL.,Si, R.,Fei, ZJ.,Fu, XX.,Lu, YZ.,...&Ning, CG.(2019).Candidate for Laser Cooling of a Negative Ion: High-Resolution Photoelectron Imaging of Th-.PHYSICAL REVIEW LETTERS,123(20),-. |
| MLA | Tang, RL,et al."Candidate for Laser Cooling of a Negative Ion: High-Resolution Photoelectron Imaging of Th-".PHYSICAL REVIEW LETTERS 123.20(2019):-. |
入库方式： OAI收割
来源：上海应用物理研究所
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