Elementary Process in the Fine Particle Plasmas and its Generation

采用舟皿法可以制备出细小的颗粒，并且其粒径可以通过舟皿温度和氩气流量进行足够精确的控制。在紫外光的持续照射下产生了细粒子等离子体。对这种等离子体的实验如下。(1)与带电球体的相互作用，在等离子体中产生小谢雷，球体的电势突然反转。粒子的吸引运动和排斥运动表明粒子处于等离子体状态。(2)与气体等离子体的混合。气体等离子体与细颗粒等离子体的混合是通过辉光放电来实现的。细小的粒子被强烈地吸引到带负电的球体上。这一事实表明，浸没在气态等离子体中的细颗粒带负电。(3)库仑晶格：带电500 V的细导线周围的细粒子产生了树状晶格，这一事实表明，细粒子等离子体处于强耦合状态。(4)电场偏转：将细粒子束引入100 V/cm的静电场。粒子束通过场后分成两束。我们可以通过分析电子束的运动来测量粒子的电荷。(5)密度测量通过入射He-Ne激光强度的衰减精确地获得平均细颗粒密度。通过散射激光强度分布观察空间密度分布。这些方法对于观测细粒子等离子体中的物理过程是非常有用的。(6)磁场偏转：将细粒子束引入到4400 G的静磁场中，粒子束通过磁场后分成两束。通过对束流运动的分析，我们可以测量粒子的变化。

Fine particles were able to generate by the boat method, and its particle size was able to control by the boat temperature and the argon gas flow with enough precisions. The fine particle plasmas were created by the irradiation of ultraviolet light constantly. Experiment on this plasmas are as follows.(1) Interaction with charged sphere.The small shere was hanged in the fine particle plasmas, and potential of sphere was inverted suddenly. The attracting motion and repulsing motion of particles indicate that particles were in plasma states.(2) Mixing with gaseous plasmas.Mixture with the fine particle plasma of gaseous plasma was performed by the glow discharge. Fine particles were attracted strongly to the negatively charged sphere. This fact indicates that the fine particles immersed in gaseous plasma are charged negatively.(3) Coulomb Lattice.The fine particles generated the tree form lattice around the fine wire charged 500 V.This fact indicates that the fine particle plasmas were in the strongly coupled state.(4) Deflection by Electric Field.Fine particle beam was introduced into the static field of 100 V/cm. Particle beam separated to two beams after pass through the field. We could measure the charge of particle by analysis of beam motions.(5) Density Measurement.The averaged fine particle density was precisely obtained by the attenuation of incident He-Ne laser light intensity. Spatial density distributions were observed by the scattered laser light intensity distributions. These methods are very useful for observing the physical process in the fine particle plasmas.(6) Deflection by Magnetic Field.Fine particle beam was introduced into the static magnetic field of 4400 G.Particle beam separated to two beams after pass through the magnetic field. We could measure the change of particle by analysis of beam motions.