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Nuclear Fusion and Plasma Physics ›› 2023, Vol. 43 ›› Issue (4): 482-488.DOI: 10.16568/j.0254-6086.202304018

• Plasma Physics • Previous Articles     Next Articles

Discharge characteristics of capacitively coupled Ar plasmas driven by different frequencies with pressure  

YUAN Qiang-hua, LIU Shan-shan, YIN Gui-qin, QIN Biao    

  1. (School of Physics and Electronic Engineering, Northwestern Normal University, Lanzhou 730070) 
  • Received:2021-04-01 Revised:2023-05-07 Online:2023-12-15 Published:2023-12-07

不同频率驱动下容性耦合Ar等离子体随气压变化的放电特性

袁强华,刘珊珊,殷桂琴,秦 彪   

  1. (西北师范大学物理与电子工程学院,兰州 730070) 
  • 作者简介:袁强华(1974−),男,江苏南通人,博士,硕士研究生导师,从事低温等离子物理研究。
  • 基金资助:
    国家自然科学基金(11665021) 

Abstract: The discharge characteristics of capacitatively coupled Ar plasmas driven by 13.56, 40.68, 94.92 and 100MHz are discussed when radio frequency power is 40W and pressure change from 3.3Pa to 26.6Pa. The electron excitation temperature and electron density were diagnosed experimentally by spectroscopic relative intensity method. Particle simulation and Monte Carlo collision model (PIC/MCC) are used to simulate the electron density and electron energy probability distribution (EEPF) under the experimental conditions. The results show that the electron density increases with the increase of pressure at each driving frequency, while the electron temperature decreases with the increase of pressure. The electron density of 13.56 and 40.68MHz has almost the same trend with the increase of pressure, while the electron temperature of 94.92 and 100MHz has almost the same trend with the increase of pressure. By comparing the EEPF, the electron temperature decreased with the increase of pressure, which was basically consistent with the spectral diagnosis results. 

Key words: Capacitively coupled Ar plasma, Optical emission spectral, PIC/MCC 

摘要: 讨论了在驱动频率分别为 13.56MHz、40.68MHz、94.92MHz 和 100MHz,功率为 40W,气压由 3.3~ 26.6Pa 下的容性耦合 Ar 等离子体的放电特性。利用光谱相对强度法分别诊断了电子激发温度和电子密度。采用 粒子模拟和蒙特卡罗碰撞模型(PIC/MCC),模拟了上述实验条件下中心处电子密度和电子能量概率分布(EEPF)。 结果表明,在每一个驱动频率下,电子密度均随放电气压的增加而增加,而电子温度则随气压增加而降低。驱动 频率为 13.56MHz 和 40.68MHz 的电子密度随气压变化趋势几乎一致,而 94.92MHz 和 100MHz 的电子温度则随气压变化趋势几乎一致。通过比较 EEPF,电子温度随气压的增加有下降的趋势,与光谱诊断结果基本吻合。

关键词: 容性耦合氩等离子体, 发射光谱法, 粒子模拟和蒙特卡罗碰撞模型

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