PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Analysis of extreme ultraviolet spectral profiles of laser-produced Cr plasmas |
L Wu(吴磊), M G Su(苏茂根), Q Min(敏琦), S Q Cao(曹世权), S Q He(何思奇), D X Sun(孙对兄), C Z Dong(董晨钟) |
Key Laboratory of Atomic and Molecular Physics & Functional Material of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China |
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Abstract Radiation from laser-produced plasmas was examined as a potential wavelength calibration source for spectrographs in the extreme ultraviolet (EUV) region. Specifically, the EUV emission of chromium (Cr) plasmas was acquired via spatio-temporally resolved emission spectroscopy. With the aid of Cowan and flexible atomic code (FAC) structure calculations, and a comparative analysis with the simulated spectra, emission peaks in the 6.5-15.0 nm range were identified as 3p-4d, 5d and 3p-4s transition lines from Cr5+-Cr10+ ions. A normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model were assumed for the spectral simulations, and used to estimate the electron temperature and density in the plasma. The results indicate that several relatively isolated emission lines of highly charged ions would be useful for EUV wavelength calibration.
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Received: 13 March 2019
Revised: 27 April 2019
Accepted manuscript online:
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PACS:
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52.38.Mf
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(Laser ablation)
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32.30.Jc
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(Visible and ultraviolet spectra)
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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300) and the National Natural Science Foundation of China (Grant Nos. 11874051, 11274254, and 11564037). |
Corresponding Authors:
M G Su, C Z Dong
E-mail: nwnu_sumg@163.com;dongcz@nwnu.edu.cn
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Cite this article:
L Wu(吴磊), M G Su(苏茂根), Q Min(敏琦), S Q Cao(曹世权), S Q He(何思奇), D X Sun(孙对兄), C Z Dong(董晨钟) Analysis of extreme ultraviolet spectral profiles of laser-produced Cr plasmas 2019 Chin. Phys. B 28 075201
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