Volume 13 Issue 6
Dec.  2020
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Chinese Optics  > 2020  >  13(6): 1385-1400.
XU Zhao-jin, ZHANG Xiao-hu, ZHANG Wen-na, HUANG Chao-hong, SHEN Li. Shift of the first ionization threshold of Sm atom in electric field[J]. Chinese Optics, 2020, 13(6): 1385-1400. doi: 10.37188/CO.2020-0071
Citation: XU Zhao-jin, ZHANG Xiao-hu, ZHANG Wen-na, HUANG Chao-hong, SHEN Li. Shift of the first ionization threshold of Sm atom in electric field[J]. Chinese Optics, 2020, 13(6): 1385-1400. doi: 10.37188/CO.2020-0071
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Shift of the first ionization threshold of Sm atom in electric field

  • 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)
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  • 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
  • Received Date: 21 Apr 2020
  • Rev Recd Date: 27 May 2020
    • Available Online: 29 Oct 2020
  • Publish Date: 01 Dec 2020
    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.

     

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