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Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme |
| Xiao-Yong Lu(卢肖勇)1,† and Ya-Peng Sun(孙亚鹏)1,2 |
1 Science and Technology on Particle Transport and Separation Laboratory, Tianjin 300180, China;
2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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Abstract The four-color three-step selective photoionization process of atom is very important in laser isotope separation technology. The population trapping phenomena and their influences are studied theoretically in monochromatic and non-monochromatic laser fields based on the density matrix theory in this work. Time evolutions of the photoionization properties of the four-color, three-step process are given. The population trapping effects occur intensely in monochromatic excitation, while it gradually turns weak as the laser bandwidth increases. The effects of bandwidth, Rabi frequency, time delay, and frequency detuning on the population trapping effect are investigated in monochromatic and non-monochromatic laser fields. The effects of laser process parameters and atomic parameters on the effective selective photoionization are also discussed. The ionization probability and selectivity factors, as evaluation indexes, are difficult to improve synchronously by adjusting systematic parameters. Besides, the existence of metastable state may play a negative role when its population is low enough.
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Received: 02 September 2023
Revised: 28 November 2023
Accepted manuscript online: 30 November 2023
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PACS:
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32.80.-t
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(Photoionization and excitation)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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37.10.Vz
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(Mechanical effects of light on atoms, molecules, and ions)
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32.70.Jz
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(Line shapes, widths, and shifts)
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Corresponding Authors:
Xiao-Yong Lu
E-mail: lu-xy15@tsinghua.org.cn
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Cite this article:
Xiao-Yong Lu(卢肖勇) and Ya-Peng Sun(孙亚鹏) Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme 2024 Chin. Phys. B 33 033202
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