ELECTRON AND ION SWARM PROCESS AND ITS APPLICATION INCLUDING INELASTIC EFFECT.

目前合作研究的是非弹性效应对电子和离子群现象的影响，这是近年来气相电子和离子化学以及其他许多应用领域最感兴趣的研究课题之一。电子（或离子）与多原子分子碰撞时发生的非弹性过程会改变它们的平动能，因为平动能部分被吸收到多原子分子的内能中，使多原子分子处于内激发态。因此，非弹性能量损失过程会严重影响许多以平动能为函数的群体参数。为了更有效地开展目前的研究计划，我们将调查人员分为三个小组。第一组研究人员发展了包括非弹性过程在内的电子和离子群理论。在玻尔兹曼分析的基础上，阐明了玻尔兹曼方程的解与含非弹性截面的输运方程的解之间的关系。第二组进行了电子和离子群实验，从测量数据中直接得到非弹性过程的信息。利用两个漂移管和一个微波仪器，测量了多原子气体中的电子附着系数、电子/离子复合系数、离子迁移率和电子迁移率。第三组主要研究了电子和离子群的应用技术，特别是与光电离和弱电离等离子体的非弹性效应有关。他们测量了等离子体中受激中性分子的数量密度和电子能量分布的弛豫时间。另外，等离子体中同位素的激光分离和弱电离等离子体中的库仑晶格分离作为两个新发展的领域也得到了广泛的研究。

The present co-operative research deals with the inelastic effect on electron-and ion-swarm phenomena, which is one of the most interesting research subjects in recent gas-phase electron-and ion-chemistry as well as many other applied fields. Inelastic proces occurred in the collisions between an electron (or an ion) and a polyatomic molecule will change their translational energies, because the translational energy will partly be absorbed into the internal energy of polyatomic molecule and will make it an internally excited state. Therefore, many swarm parameters which are functions of the translational energy will seriously be affected by the inelastic energy loss process.In order to carry out the present research program more effectively, we haved devided the investigators into three sub-groups.The researchers in the first group have developed electron and ion swarm theory including inelastic process. Based upon Boltzmann analysis, they have elucidated the relation between the solutions of Boltzmann equation and the transport equation including inelastic cross sections.The second group have carried out the experiments on electron and ion swarm to derive directly the information on the inelastic process from the measurement data. Using two drift tubes and a micro-wave apparatus, the members have measured the coefficients of electron attachment, electron/ion recombination, ion mobility, and electron mobility in polyatomic gases.The third group have mainly investigated the applied techniques of electron and ion swarms, related especially to the inelastic effect on photo ionization and weakly ionized plasmas. They have measured the number density of excited neutral molecules in plasma and the relaxation time of electron energy distribution. Also, as two newly developed fields, the separation of isotopes in plasma using laser beam technique and Coulomb lattice in weakly ionized plasma have intensively been investigated.