自由电子激光制备高强度亚稳态氦原子和类氦离子

杜小娇; 魏龙; 孙羽; 胡水明

doi:10.7498/aps.73.20240554

摘要

在少电子原子精密光谱测量中, 产生高强度、单一量子态的氦原子和类氦离子是实验研究的关键, 也是改善实验测量信噪比的决定性因素. 本文提出利用自由电子激光获得高强度亚稳态氦原子和类氦离子的实验方案. 激光的制备效率可以通过求解光和原子相互作用的主方程获得, 根据拟建设的深圳自由电子激光装置的设计参数和实验条件, 计算得到亚稳态He, Li⁺和Be²⁺的制备效率分别可达3%, 6%和2%以上. 与常见的气体放电和电子轰击等制备方法相比, 激光激发产生亚稳态原子/离子不仅可以提高制备产率, 也可以降低放电时产生的电子、离子以及光子等高能杂散粒子的影响. 利用自由电子激光激发制备亚稳态氦原子和类氦离子有望应用于多个研究领域.

关键词:

Abstract

In the precision spectroscopy of few-electron atoms, the generation of high-intensity metastable helium atoms and helium-like ions is crucial for implementing experimental studies as well as a critical factor for improving the signal-to-noise ratio of experimental measurements. With the rapid development of free-electron laser (FEL) and technology, FEL wavelengths extend from hard X-rays to soft X-rays and even vacuum ultraviolet bands. Meanwhile, laser pulses with ultra-fast, ultra-intense and high repetition frequencies are realized, thus making it possible for FEL to prepare single-quantum state atoms/ions with high efficiency. In this work, we propose an experimental method for obtaining high-intensity single-quantum state helium atoms and helium-like ions by using FEL. The preparation efficiency can be calculated by solving the master equation of light-atom interaction. Considering the experimental parameters involved in this work, we predict that the efficiencies of preparing metastable 2³S He, Li⁺ and Be²⁺ are about 3%, 6% and 2%, respectively. Compared with the common preparation methods such as gas discharge and electron bombardment, a state-of-the-art laser excitation method can not only increase the preparation efficiency, but also reduce the effects of high-energy stray particles such as electrons, ions, and photons generated during discharge. Furthermore, combined with the laser preparation technique, the sophisticated ion confinement technique, which can ensure a long interaction time between the ions and laser, increases the efficiency of metastable Li⁺ and Be²⁺ by several orders of magnitude. Therefore, the preparation of high-intensity metastable helium and helium-like ions can improve the measurement accuracy of precision spectroscopy of atoms and ions. A new experimental method, based on FEL, to study the fine structure energy levels 2³P of helium, has the potential to obtain the results with an accuracy exceeding the sub-kHz level. Thus, the high-precision fine structure constants can be determined with the development of high-order quantum electrodynamics theory. In order to measure energy levels with higher accuracy, a new detection technique, which can reduce or even avoid more systematic effects, must be developed. For example, the quantum interference effect, which has been proposed in recent years, seriously affects the accuracy of fine-structure energy levels. If the interference phenomenon of spontaneous radiation between different excited states can be avoided in the detection process, the measurement accuracy will not be affected by this quantum interference effect. High-intensity metastable atoms or ions in chemical reaction dynamics studies also have better chances to investigate reaction mechanisms. In summary, the FEL preparation of high-intensity metastable helium atoms and helium-like ions proposed in this work will lay an important foundation for developing cold atom physics and chemical reaction dynamics.

Keywords:

metastable helium and helium-like ions /
precision spectroscopy /
free electron laser /
signal-to-noise ratio /
preparation effciency

作者及机构信息

1.
深圳综合粒子设施研究院, 深圳　518107

2.
中国科学技术大学化学物理系, 合肥　230026

通信作者: 孙羽, sunyu@mail.iasf.ac.cn

基金项目: 国家自然科学基金(批准号: 12304291, 22241301, 91736101, 12393822)和国家科技部博士后基金(批准号: 2022M723062)资助的课题.

Authors and contacts

1.
Institute of Advanced Science Facilities, Shenzhen 518107, China

2.
Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China

Corresponding author: Sun Yu, sunyu@mail.iasf.ac.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12304291, 22241301, 91736101, 12393822) and the Science Foundation for Postdoctoral Research of the Ministry of Science and Technology of China (Grant No. 2022M723062).

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参考文献

[1]	Heydarizadmotlagh F, Skinner T D G, Kato K, George M C, Hessels E A 2024 Phys. Rev. Lett. 132 163001 Google Scholar
[2]	Wen J L, Tang J D, Dong J F, Du X J, Hu S M, Sun Y R 2023 Phys. Rev. A 107 042811 Google Scholar
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施引文献

图 1 (a)制备亚稳态氦原子的相关能级; (b)制备亚稳态氦原子/类氦离子的装置示意图

Fig. 1. (a) Energy levels for the preparation of metastable helium; (b) schematic of designed apparatus for the preparation of metastable helium/helium-like ions.

下载: 全尺寸图片幻灯片

图 2 单脉冲作用时单个氦原子不同能级布居数的时间演化结果

Fig. 2. Time evolution for different energy levels of helium by single-pulse excitation.

下载: 全尺寸图片幻灯片

图 3 激光制备亚稳态氦原子的效率随光斑大小的模拟结果

Fig. 3. Simulation results of preparation efficiency of metastable helium with respect to spot size.

下载: 全尺寸图片幻灯片

图 4 激发效率随同步辐射光通量的变化

Fig. 4. Excitation efficiency as a function of the photon flux for synchrotron radiation sources.

下载: 全尺寸图片幻灯片

图 5 制备亚稳态$ {\rm{Li^{+}}} $和$ {\rm{Be^{2+}}} $的相关能级示意图

Fig. 5. Energy levels of metastable $ {\rm{Li^{+}}} $ and $ {\rm{Be^{2+}}} $.

下载: 全尺寸图片幻灯片

下载: 全尺寸图片幻灯片

map

[1]	Heydarizadmotlagh F, Skinner T D G, Kato K, George M C, Hessels E A 2024 Phys. Rev. Lett. 132 163001 Google Scholar
[2]	Wen J L, Tang J D, Dong J F, Du X J, Hu S M, Sun Y R 2023 Phys. Rev. A 107 042811 Google Scholar
[3]	Henson B, Ross J, Thomas K, et al. 2022 Science 376 199 Google Scholar
[4]	Tiesinga E, Mohr P J, Newell D B, Taylor B N 2021 J. Phys. Chem. Ref. Data 50 033105 Google Scholar
[5]	Sun Y R, Hu S M 2020 Natl. Sci. Rev. 7 1818 Google Scholar
[6]	Chen J J, Sun Y, Wen J L, Hu S M 2020 Phys. Rev. A 101 053824 Google Scholar
[7]	Kato K, Skinner T, Hessels E 2018 Phys. Rev. Lett. 121 143002 Google Scholar
[8]	郑昕, 孙羽, 陈娇娇, 胡水明 2018 67 164203 Google Scholar Zheng X, Sun Y R, Chen J J, Hu S M 2018 Acta Phys. Sin. 67 164203 Google Scholar
[9]	Zheng X, Sun Y, Chen J J, Jiang W, Pachucki K, Hu S M 2017 Phys. Rev. Lett. 119 263002 Google Scholar
[10]	Feng G P, Zheng X, Sun Y R, Hu S M 2015 Phys. Rev. A 91 030502 Google Scholar
[11]	Zheng X, Sun Y, Chen J J, Jiang W, Pachucki K, Hu S M 2017 Phys. Rev. Lett. 118 063001 Google Scholar
[12]	Vutha A C, Hessels E A 2015 Phys. Rev. A 92 052504 Google Scholar
[13]	Pastor P C, Consolino L, Giusfredi G, De Natale P, Inguscio M, Yerokhin V, Pachucki K 2012 Phys. Rev. Lett. 108 143001 Google Scholar
[14]	Smiciklas M, Shiner D 2010 Phys. Rev. Lett. 105 123001 Google Scholar
[15]	Borbely J, George M, Lombardi L, Weel M, Fitzakerley D, Hessels E 2009 Phys. Rev. A 79 060503 Google Scholar
[16]	Giusfredi G, Pastor P C, Natale P D, Mazzotti D, Mauro C d, Fallani L, Hagel G, Krachmalnicoff V, Inguscio M 2005 Can. J. Phys. 83 301 Google Scholar
[17]	Zelevinsky T, Farkas D, Gabrielse G 2005 Phys. Rev. Lett. 95 203001 Google Scholar
[18]	George M, Lombardi L, Hessels E 2001 Phys. Rev. Lett. 87 173002 Google Scholar
[19]	Sun W, Zhang P P, Zhou P P, Chen S L, Zhou Z Q, Huang Y, Qi X Q, Yan Z C, Shi T Y, Drake G W F, Zhong Z X, Guan H, Gao K L 2023 Phys. Rev. Lett. 131 103002 Google Scholar
[20]	Scholl T J, Cameron R, Rosner S D, Zhang L, Holt R A, Sansonetti C J, Gillaspy J D 1993 Phys. Rev. Lett. 71 2188 Google Scholar
[21]	Schwartz C 1964 Phys. Rev. 134 A1181 Google Scholar
[22]	Paliwal P, Deb N, Reich D M, van der Avoird A, Koch C P, Narevicius E 2021 Nat. Chem. 13 94 Google Scholar
[23]	Klein A, Shagam Y, Skomorowski W, Zuchowski P S, Pawlak M, Janssen L M, Moiseyev N, Meerakker S Y V D, Avoird A V D, Koch C P, Narevicius E 2017 Nat. Phys. 13 35 Google Scholar
[24]	Henson A B, Gersten S, Shagam Y, Narevicius J, Narevicius E 2012 Science 338 234 Google Scholar
[25]	Martin D W, Weiser C, Sperlein R F, Bernfeld D L, Siska P E 1989 J. Chem. Phys 90 1564 Google Scholar
[26]	Pachucki K, Yerokhin V A 2023 Phys. Rev. Lett. 130 053002 Google Scholar
[27]	Yerokhin V A, Patkóš V, Pachucki K 2023 Phys. Rev. A 107 012810 Google Scholar
[28]	Patkóš V, Yerokhin V A, Pachucki K 2021 Phys. Rev. A 103 042809 Google Scholar
[29]	Pachucki K, Yerokhin V A 2010 Phys. Rev. Lett. 104 070403 Google Scholar
[30]	Pachucki K, Patkóš V C V, Yerokhin V A 2023 Phys. Rev. A 108 052802 Google Scholar
[31]	Yerokhin V A, Patkóš V, Pachucki K 2022 Phys. Rev. A 106 022815 Google Scholar
[32]	Pachucki K 2022 Phys. Rev. A 106 022802 Google Scholar
[33]	Qi X Q, Zhang P P, Yan Z C, Shi T Y, Drake G W F, Chen A X, Zhong Z X 2023 Phys. Rev. A 107 L010802 Google Scholar
[34]	Qi X Q, Zhang P P, Yan Z C, Drake G W F, Zhong Z X, Shi T Y, Chen S L, Huang Y, Guan H, Gao K L 2020 Phys. Rev. Lett. 125 183002 Google Scholar
[35]	Johnson W R, Cheng K T, Plante D R 1997 Phys. Rev. A 55 2728 Google Scholar
[36]	Tang K T, Toennies J P 1984 J. Chem. Phys. 80 3726 Google Scholar
[37]	Cheng C F, Jiang W, Yang G M, Sun Y R, Pan H, Gao Y, Liu A W, Hu S M 2010 Rev. Sci. Instrum. 81 123106 Google Scholar
[38]	Kponou A, Hughes V W, Johnson C E, Lewis S A, Pichanick F M J 1981 Phys. Rev. A 24 264 Google Scholar
[39]	Scholl T J, Holt R A, Rosner S D 1989 Phys. Rev. A 39 1163 Google Scholar
[40]	Chen S L, Liang S Y, Sun W, Huang Y, Guan H, Gao K L 2019 Rev. Sci. Instrum. 90 043112 Google Scholar
[41]	Bergeson S D, Balakrishnan A, Baldwin K, Lucatorto T B, Marangos J, McIlrath T, O’Brian T R, Rolston S, Sansonetti C J, Wen J 1998 Phys. Rev. Lett. 80 3475 Google Scholar
[42]	Wang J S, Ritterbusch F, Dong X Z, Gao C, Li H, Jiang W, Liu S Y, Lu Z T, Wang W H, Yang G M, Zhang Y S, Zhang Z Y 2021 Phys. Rev. Lett. 127 023201 Google Scholar
[43]	Steck D A 2017 Quantum and Atom Optics (Eugene: University of Oregon
[44]	Baig M 2022 Atoms 10 39 Google Scholar
[45]	Chen S L, Zhou P P, Liang S Y, Sun W, Sun H Y, Huang Y, Guan H, Gao K L 2020 Chin. Phys. Lett. 37 073201 Google Scholar

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自由电子激光制备高强度亚稳态氦原子和类氦离子