Acta Physica Sinica, Volume. 69, Issue 5, 057401-1(2020)
Fig. 1. Experiment setup for the air pressure influence on the characteristics of air plasma induced by ns pulsed laser.
Fig. 2. The optical emission spectroscopy of the air plasma (air pressure of 100 kPa).
Fig. 3. The optical emission spectroscopy of the air plasma at different air pressure.
Fig. 4. The air plasma spectral intensity evolution with air pressure (O Ι 777.2 nm, N Ι 746.8 nm, and N II 500.5 nm).
Fig. 5. The air plasma density evolutions with air pressure (100 kPa O Ι 844.6 nm spectral line fitting).
Table 1. Identification of the observed emission lines of N and O.
View tableView in ArticleTable 1. Identification of the observed emission lines of N and O.
谱线种类 谱线位置/nm 跃迁形式 N+ 399.5 3p(1D) → 3s(1P0) N+ 444.7 3d(3D0) → 3p(3D) O+ 464.9 3p(4D0) → 3s(4P) N+ 500.5 3p(3S) → 3s(3P0) N+ 517.6 3d(5D) → 3p(5P0) N+ 568.0 3p(3D) → 3s(3P0) O 715.7 3p(1D2) → 3s( $^1{\rm{D}}_2^0$ O 777.2 3p(5P) → 3s(5S0) N 821.6 3p(4P0) → 3s(4P) O 844.7 3p(3P) → 3s(3S0) N 868.3 3p(4D0) → 3s(4P)
Table 2. Oxygen atomic line spectral information.
View tableView in ArticleTable 2. Oxygen atomic line spectral information.
Wavelength/nm Em/eV En/eV Aki/s–1 gk O II 444.8 31.15 28.36 2.52×106 6 O Ι 844.6 10.99 9.52 3.22×107 3
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Jia-He Liu, Jia-Zhe Lu, Jun-Jie Lei, Xun Gao, Jing-Quan Lin.
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Received: Oct. 10, 2019
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Published Online: Nov. 18, 2020
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