电场中Sm原子的第一电离阈移动 -

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电场中Sm原子的第一电离阈移动

天津理工大学理学院，天津 300384

中图分类号:O433.1;O433.2
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出版历程
- 收稿日期:2020-04-21
- 修回日期:2020-05-27
- 网络出版日期:2020-10-29
- 刊出日期:2020-12-01

Shift of the first ionization threshold of Sm atom in electric field

doi:10.37188/CO.2020-0071

School of Science, Tianjin University of Technology, Tianjin 300384, China

Funds:Supported by National Natural Science Foundation of China (No. 11604243); Program for Innovative Research Team in University of Tianjin (No. TD3-5029); National Undergraduate Training Programs for Innovation and Entrepreneurship (No. 201810060026)

More Information

Author Bio:
Xu Zhaojin (1978—), male, born in Minhou, Fujian. He is an associate professor with a master’s degree. In 2005, he received his master's degree from Nankai University. Now he is an associate professor of the School of Science, Tianjin University of Technology, mainly engaged in the research of spectroscopy and its application. E-mail:xuzhaojin1234@126.com
Shen Li (1982—), male, born in Wuhan, Hubei. He is an associate professor with a doctorate. In 2009, he received his PhD from the Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences. Now he is an associate professor of the School of Science, Tianjin University of Technology, mainly engaged in the research of spectroscopy and its application. E-mail:shenli@tjut.edu.cn

Corresponding author:shenli@tjut.edu.cn

摘要

摘要:为了获得Sm原子的第一电离阈，将Sm原子多步激发产生的光电离、自电离和场电离信号进行了区分，并研究了不同磁量子数Rydberg态Sm原子对第一电离阈的影响。首先，结合多步共振激发和偏振组合技术，将稀土Sm原子激发到第一电离阈附近具有特定磁量子数的自电离或束缚Rydberg态。接着，通过反向静电场将光电离和自电离等过程产生的离子推出作用区。然后，通过施加延时脉冲电场对束缚Rydberg态Sm原子进行探测。最后，通过改变静电场强度获得了Sm原子第一电离阈随着静电场强度的变化情况，拟合确定了零场下不同磁量子数Sm原子的第一电离阈。实验结果表明：Sm原子的第一电离阈为45519.69±0.17 cm ⁻¹；该结果与用其它方法获得的结果进行了比较。实验验证了延时场电离探测技术用于测量Sm原子第一电离阈的有效性。
- 光电离/
- 场电离/
- 第一电离阈/
- Sm原子/
- 高激发态光谱
Abstract:In order to obtain the first ionization threshold of Sm atom, the photoionization signal, autoionization signal and field ionization signal generated by the Sm atom under multi-step excitation were distinguished, and the influence of the Rydberg state of the Sm atom with different magnetic quantum numbers on the first ionization threshold was studied. At first, by use of multi-step resonance excitation combined with polarization technology, the rare-earth Sm atoms were excited to the autoionization or bound Rydberg state with a specific magnetic quantum number near the first ionization threshold. Then the ions generated by photoionization and autoionization were pushed out of the action zone by the reverse electrostatic field, and a delayed pulsed electric field was applied to detect the Sm atoms of bound Rydberg state. Finally, the relationship between the first ionization threshold of Sm atom and the varying intensity of electrostatic field was acquired, and the first ionization threshold of the Sm atom with different magnetic quantum numbers under zero field was determined by fitting. The experimental results show that the first ionization threshold of Sm atom is 45519.69±0.17 cm ⁻¹, which has been compared with the results obtained by other methods. The effectiveness of the delayed field ionization technique in measuring the first ionization threshold of Sm atom has been verified.
- photoionization/
- field ionization/
- first ionization threshold/
- Sm atom/
- spectra of highly excited state

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图 1实验装置图

Figure 1.Experimental setup diagram

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图 2Sm原子的多步激发路径示意图

Figure 2.Schematic diagram of multistep excitation path of Sm atom

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图 3零场和电场下Sm原子在第一电离阈附近的光谱图

Figure 3.Spectra of the Sm atom near the first ionization threshold under zero and electric fields

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图 4t_d=38.5 μs时，在零场和电场下Sm原子第一电离阈附近的光谱图

Figure 4.Spectra of the Sm atom near the first ionization threshold under zero and electric fields att_d=38.5 μs

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图 5Sm原子在静电场为1.9993 V·cm⁻¹时的光谱图

Figure 5.Spectra of Sm atom under the electrostatic field of 1.9993 V·cm⁻¹

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图 6三步不同偏振组合下，Sm原子第一电离阈随静电场强度改变而移动的规律图。(a) π + π+ π; (b) π + π+ σ; (c) σ⁺+ σ⁺+ σ⁺

Figure 6.Diagram of the first ionization threshold of Sm atom shifting with the change of electrostatic field intensity under different polarization combinations of three-step lasers. (a) π + π+ π; (b) π + π+ σ; (c) σ⁺+ σ⁺+ σ⁺

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表 1Magnetic quantum numbers of Sm atom in 4f⁶6snkstate excited by different polarization combinations ofλ₁,λ₂andλ₃

Table 1.Magnetic quantum numbers of Sm atom in 4f⁶6snkstate excited by different polarization combinations ofλ₁,λ₂andλ₃

Combination 组合	Polarization state 偏振状态			Magnetic quantum number 磁量子数
Combination 组合	λ₁	λ₂	λ₃	m
1	π	π	π	0
2	π	π	σ	±1
3	σ⁺	σ⁺	σ⁺	3

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表 2Fitting results of the first ionization threshold of the Sm atom with different magnetic quantum numbers

Table 2.Fitting results of the first ionization threshold of the Sm atom with different magnetic quantum numbers

Combination 组合	Magnetic quantum number,m 磁量子数m	Ionization threshold/ cm⁻¹ 电离阈/ cm⁻¹
1	0	45519.67±0.21
2	±1	45519.46±0.18
3	3	45519.95±0.11

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