低温氩等离子体中火球的光谱研究

S. Guare, D. Dimitriu, C. Ionita, R. Schrittwieser
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摘要

只提供摘要形式。将电极浸入低温等离子体中,使其正偏置到一定的阈值,在其面前出现复杂的空间电荷结构,即发光的准球形等离子体。这种结构有时被称为阳极辉光、火球或火球。实验研究表明,这种结构由一个被电双层限制的正核(富离子等离子体)组成。跨双层的电势下降几乎等于背景气体原子的电离电势。通过这种电位下降加速来自周围等离子体的电子,双层可以保持带电粒子(电子和正离子)的产生和损失之间的平衡,确保结构的存在。本文报道了氩等离子体中这种复杂空间电荷结构的光谱研究。光谱域为550 ~ 750nm,可以识别出氩的不同激发态对应的谱线。通过记录电极前不同位置的光谱,得到了火球的光谱轮廓。所得结果对火球外观和动力学起源的基本过程,即电子中性撞击激发和电离有了新的认识。
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Spectral investigation of a fireball in low-temperature argon plasma
Summary form only given. By positively biasing an electrode immersed into low-temperature plasma up to a certain threshold value, a complex space charge structure appears in front of it, in form of a luminous quasi-spherical plasma body. This structure was sometimes called anode glow, ball of fire or fireball. Experimental investigation shown that such a structure consists of a positive nucleus (ion-enriched plasma) confined by an electrical double layers. The potential drop across the double layer is almost equal to the ionization potential of the background gas atoms. By accelerating the electrons from the surrounding plasma through this potential drop, the double layer can maintain the equilibrium between the production and the losses of the charged particles (electrons and positive ions), ensuring the existence of the structure. Here we report on the spectral investigation of such a complex space charge structure, in argon plasma. The spectral domain was 550-750 nm, identifying the lines corresponding to different excited states of the argon. The spectral profile of the fireball was obtained by recording the spectra at different positions in front of the electrode. The obtained results shed a new light on the elementary processes at the origin of the appearance and dynamics of the fireball, namely the electron-neutral impact excitations and ionizations.
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