Measurement of the first Townsend's ionization coefficient for atmospheric pressure neon by a dielectric barrier discharge

Junxia RAN (冉俊霞); Haiyun LUO (罗海云); Caixia LI (李彩霞); Xiaowei LI (李晓苇); Xuechen LI (李雪辰)

doi:10.1088/2058-6272/ab935b

Plasma Science and Technology > 2020 > 22(10): 105401. > DOI: 10.1088/2058-6272/ab935b

Junxia RAN (冉俊霞), Haiyun LUO (罗海云), Caixia LI (李彩霞), Xiaowei LI (李晓苇), Xuechen LI (李雪辰). Measurement of the first Townsend's ionization coefficient for atmospheric pressure neon by a dielectric barrier discharge[J]. Plasma Science and Technology, 2020, 22(10): 105401. DOI: 10.1088/2058-6272/ab935b

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Measurement of the first Townsend's ionization coefficient for atmospheric pressure neon by a dielectric barrier discharge

¹College of Physics Science and Technology, Hebei University, Baoding 071002, People's Republic of China
² Hebei Key Lab of Optic-Electronic Information and Materials, Baoding 071002, People's Republic of China
³ Institute of Life Science and Green Development, Hebei University, Baoding 071002, People's Republic of China
⁴ State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

Funds: This research is supported by Postdoctoral Project of Hebei University, National Natural Science Foundation of China (Nos. 11575050, 11875121, 51977057) and Hebei Natural Science Fund (Nos. A2017201099, A2020201008).

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Received Date: October 29, 2019
Revised Date: May 12, 2020
Accepted Date: May 13, 2020

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Abstract

Abstract

Fast photography and optical emission spectroscopy are implemented in a 5 mm neon gap dielectric barrier discharge (DBD) at atmospheric pressure with quartz glass used as the dielectric layer. Results show that it starts with a Townsend discharge and ends at a sub-normal glow discharge in neon DBD. Based on the Townsend discharge, the first ionization coefficient of neon is measured. The measurements are consistent with those at low pressure. Optical emission spectroscopy indicates that the spectra are mainly composed of atomic lines of neon, molecular bands and molecular ion bands originating from inevitable gas impurities (mainly nitrogen). Moreover, spectral lines emitted from atomic neon corresponding to the transitions (2p⁵ 3p → 2p⁵ 3s) are predominant. Although the second positive system of N₂(C³Π_u → B³Π_g) is observed, their intensities are too weak compared with neon's spectrum. The molecular nitrogen ion line of 391.4 nm is observed. It reveals that Penning ionization between high energy neon excited states and the inevitable gas impurities plays an important role in the value of the α coefficient.
- gas discharge,
- first Townsend’s ionization coefficient,
- Townsend discharge,
- spectraldiagnosis,
- dielectric barrier discharge

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References

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Measurement of the first Townsend's ionization coefficient for atmospheric pressure neon by a dielectric barrier discharge