Effect of dielectronic recombination on charge-state distribution in laser-produced plasma based on steady-state collisional-radiative models

Haidong LU (卢海东); Maogen SU (苏茂根); Qi MIN (敏琦); Shiquan CAO (曹世权); Siqi HE (何思奇); Chenzhong DONG (董晨钟); Yanbiao FU (符彦飙)

doi:10.1088/2058-6272/ab9889

Plasma Science and Technology > 2020 > 22(10): 105001. > DOI: 10.1088/2058-6272/ab9889

Haidong LU (卢海东), Maogen SU (苏茂根), Qi MIN (敏琦), Shiquan CAO (曹世权), Siqi HE (何思奇), Chenzhong DONG (董晨钟), Yanbiao FU (符彦飙). Effect of dielectronic recombination on charge-state distribution in laser-produced plasma based on steady-state collisional-radiative models[J]. Plasma Science and Technology, 2020, 22(10): 105001. DOI: 10.1088/2058-6272/ab9889

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Effect of dielectronic recombination on charge-state distribution in laser-produced plasma based on steady-state collisional-radiative models

¹ Key Laboratory of Atomic and Molecular Physics & Functional Material of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
² Joint Laboratory of Atomic and Molecular Physics, Northwest Normal University and Institute of Modern Physics of Chinese Academy of Sciences, Lanzhou 730070, People's Republic of China

Funds: This work is supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300), National Natural Science Foundation of China (NSFC) (Grant Nos. 11904293, 11874051).

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Received Date: March 06, 2020
Revised Date: May 28, 2020
Accepted Date: May 31, 2020

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Abstract

Abstract

Armed with four different steady-state collisional-radiative (CR) models, we investigated the effect of dielectronic recombination (DR) on the charge-state distribution in laser-produced silicon plasma. To assess this effect, we performed a series of temporally resolved spectra of highly charged Si ions in the extreme ultraviolet region. Ab initio calculations of the DR rate coefficients were done for Si⁶⁺–Si⁴⁺ ions. We also analyzed the evolution of the collisional ionization, radiative recombination, three-body recombination, photo-ionization, and DR rate coefficients as a function of electron temperature. The electron temperature and electron density for different delay times were obtained by comparing the normalized experimental and simulated spectra. The ion fraction and average charge state from the four different CR models were also obtained. The results indicate that the DR process has a greater influence in the stage of plasma evolution that cannot be neglected in plasma diagnoses.
- dielectronic recombination,
- laser-produced plasmas,
- collisional-radiative model,
- charge-state distribution

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References (31)

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