Ionization degree for strong evaporation of metals
Ionization degree for strong evaporation of metals
复制标题
DOI：
10.1063/1.2002229
复制
发表时间：
2005-08
影响因子：
2.2
通讯作者：
A. Gusarov;K. Aoki
中科院分区：
文献类型：
--
作者：
A. Gusarov;K. Aoki
本文数值求解了强蒸发时在凝聚相中形成的等离子体鞘层中离子和中性粒子的动力学方程。玻尔兹曼分布被假定为电子。考虑了德拜长度远小于平均自由程的弱电离蒸气。这对于金属的激光蒸发是典型的。在这些条件下，鞘层由Knudsen层和Knudsen层与凝聚相之间的薄电荷分离层组成。从准中性条件出发，得到了克努森层中的自洽静电场。电荷分离层中的势垒由电荷平衡决定。由饱和蒸气参数，用详细平衡原理估计了中性粒子和电荷的动力学边界条件。鞘层中电荷的输运受离子控制，并依赖于离子-中性碰撞和自洽静电场。蒸汽中的电离度...
Kinetic equations for ions and neutrals are numerically solved in the plasma sheath formed at a condensed phase when strong evaporation is taking place. The Boltzmann distribution is assumed for electrons. A weakly ionized vapor with the Debye length much shorter than the mean free path is considered. This is typical for laser evaporation of metals. Under these conditions, the sheath consists of a Knudsen layer and a thin charge separation layer between the Knudsen layer and the condensed phase. The self-consistent electrostatic field in the Knudsen layer is obtained from the quasineutrality condition. The potential barrier in the charge separation layer is determined by the charge balance. Kinetic boundary conditions for neutrals and charges are estimated by the detailed balance principle from the parameters of the saturated vapor. The transport of charges in the sheath is controlled by ions and depends on ion-neutral collisions and the self-consistent electrostatic field. Ionization degree in the vapor ...