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Time-resolved molecular non-equilibrium spectra in nanosecond laser induced air plasma |
| Xuteng Zhang(张续腾)1,2, Chaobo Yang(杨超博)1,2,†, Xun Yuan(袁勋)1,2, Minghong Han(韩明宏)1,2, Zhen Cao(曹振)1,2,‡, Jiangbo Peng(彭江波)1,2, and Xin Yu(于欣)1,2 |
1 National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China;
2 Institute of Opt-electronics, Harbin Institute of Technology, Harbin 150001, China |
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Abstract We performed a quantitative analysis of time-resolved laser-induced breakdown air plasma spectra to obtain the evolution of temperatures and species relative fractions. The air plasma was generated by focusing a 100 mJ Nd:YAG laser pulse, and the time-resolved spectra were recorded by an intensified charge-coupled device camera with incremental delay. The attention was mainly focused on the emission spectra of the first negative system of nitrogen ($\rm N_2^+$, $\rm{B}^2\Sigma_{\rm u}^{-}$-$\rm{X}^2\Sigma_{\rm g}^+$) and the violet system of carbon nitride (CN, $\rm{B}^2\Sigma^{+}$-$\rm{X}^2\Sigma^+$) located at 383-396 nm. A custom-built model was developed to perform the simulation and fitting of the $\rm N_2^+$ and the $\rm CN$ spectra from the air plasma. The model was verified by comparing to a published model with a 0.9860 Spearman correlation coefficient. With this model, the time-resolved non-equilibrium temperatures and relative fractions of $\rm N_2^+$ and $\rm CN$ were obtained with a fitting correlation coefficient higher than 0.9108.
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Received: 05 March 2025
Revised: 03 June 2025
Accepted manuscript online: 09 June 2025
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PACS:
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47.70.Nd
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(Nonequilibrium gas dynamics)
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52.25.Tx
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(Emission, absorption, and scattering of particles)
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33.20.-t
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(Molecular spectra)
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02.70.Hm
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(Spectral methods)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62305087). |
Corresponding Authors:
Chaobo Yang, Zhen Cao
E-mail: yangchaobo@hit.edu.cn;caozhen1995@hit.edu.cn
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Cite this article:
Xuteng Zhang(张续腾), Chaobo Yang(杨超博), Xun Yuan(袁勋), Minghong Han(韩明宏), Zhen Cao(曹振), Jiangbo Peng(彭江波), and Xin Yu(于欣) Time-resolved molecular non-equilibrium spectra in nanosecond laser induced air plasma 2025 Chin. Phys. B 34 094701
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