Elementary Process in the Fine Particle Plasmas and its Generation

采用船形法可以生成细小颗粒，并且可以通过船形温度和氩气流量对其粒度进行精确控制。细粒子等离子体是通过紫外光的持续照射而产生的。对这种等离子体的实验如下。(1)与带电球的相互作用。小球体在细粒子等离子体中被悬挂，球体势突然反转。粒子的吸引运动和排斥运动表明粒子处于等离子态。(2)与气体等离子体混合。用辉光放电与气体等离子体中的细颗粒等离子体混合。细颗粒被强烈地吸引到带负电的球体上。这一事实表明，浸泡在气体等离子体中的微粒带负电荷。(3)库仑点阵。细粒子在带电500v的细导线周围形成树形晶格。这表明细粒子等离子体处于强耦合状态。(4)电场偏转。在100 V/cm的静场中引入细粒子束。粒子束通过场后分离成两束。我们可以通过分析光束运动来测量粒子的电荷。(5)密度测量。通过入射He-Ne激光光强的衰减，精确地得到了平均细粒子密度。利用散射激光光强分布观测了空间密度分布。这些方法对于观察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4400 g的静磁场中，粒子束通过磁场后分离成两束。我们可以通过分析光束的运动来测量粒子的变化。

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.