中国物理B ›› 2025, Vol. 34 ›› Issue (9): 94701-094701.doi: 10.1088/1674-1056/ade24a

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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. 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
  • 收稿日期:2025-03-05 修回日期:2025-06-03 接受日期:2025-06-09 出版日期:2025-08-21 发布日期:2025-09-04
  • 通讯作者: Chaobo Yang, Zhen Cao E-mail:yangchaobo@hit.edu.cn;caozhen1995@hit.edu.cn
  • 基金资助:
    non-equilibrium|time-resolved|diatomic molecule|optical emission spectroscopy

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. 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
  • Received:2025-03-05 Revised:2025-06-03 Accepted:2025-06-09 Online:2025-08-21 Published:2025-09-04
  • Contact: Chaobo Yang, Zhen Cao E-mail:yangchaobo@hit.edu.cn;caozhen1995@hit.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 62305087).

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摘要： 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.

关键词: non-equilibrium, time-resolved, diatomic molecule, optical emission spectroscopy

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.

Key words: non-equilibrium, time-resolved, diatomic molecule, optical emission spectroscopy

中图分类号:  (Nonequilibrium gas dynamics)

  • 47.70.Nd
52.25.Tx (Emission, absorption, and scattering of particles) 33.20.-t (Molecular spectra) 02.70.Hm (Spectral methods)