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Modeling carbonaceous particle formation in an argon graphite cathode dc discharge

机译:模拟氩石墨阴极直流放电中碳质颗粒的形成

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We develop a model for the nucleation, growth and transport of carbonaceous dust particles in a non-reactive gas dc discharge where the carbon source is provided by cathode sputtering. We consider only the initial phase of the discharge when the dust charge density remains small with respect to the electron density. We find that an electric field reversal at the entrance of the negative glow region promotes trapping of negatively charged clusters and dust particles, confining them for long times in the plasma and favoring molecular growth. An essential ingredient for this process is electron attachment, which negatively charges the initially neutral clusters. We perform sensitivity studies on several number parameters: size of the largest molecular edifice, sticking coefficient, etc.
机译:我们开发了一个模型,用于非反应性气体直流放电中碳尘颗粒的成核,生长和运输,其中碳源由阴极溅射提供。当灰尘电荷密度相对于电子密度保持较小时,我们仅考虑放电的初始阶段。我们发现,在负辉光区域入口处的电场反转会促进带负电的团簇和尘埃颗粒的捕获,将它们长时间限制在等离子体中并有利于分子生长。该过程的必要成分是电子附着,它会使最初的中性簇带负电。我们对几个数字参数进行敏感性研究:最大分子大厦的大小,黏着系数等。

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