Investigation of Many Body Effect in Cluster Collisions

簇碰撞中多体效应的研究

基本信息

批准号：
05044219
负责人：
TERASAKI Akira
金额：
--
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Overseas Scientific Survey.
财政年份：
1993
资助国家：
日本
起止时间：
1993 至无数据
项目状态：
已结题

项目摘要

We have investigated the following collisional reactions involving clusters to elucidate the mechanisms of the many-body processes. The studies were carried out in the Joint Research with Prof. H. O. Lutz of Universitat Bielefeld, Germany.1.The collision-induced reactions of molecular (argon and methanol) and metal (sodium) cluster ions with rare gas atoms were studied. In the molecular clusters, highly efficient internal excitation was observed, which was explained by the interaction of the target atom with only one of the constituent molecules. In the metal cluster, the internal excitation was less efficient and the dissociation process was dependent on the cluster size.2.When a cluster collides with a high-energy ion, a multiply charged cluster ion is formed, which dissociates through the Coulomb explosion. We developed a method deducing the structure and the dissociation dynamics of the initial cluster from the space- and velocity-distributions of fragment ions thus produced.3.The reaction of metal clusters, Al_n^+, with an organic molecule, isoprene, was investigated. The size dependence of adsorptivity was closely correlated with that of the ionization potential of Al_n. This fact suggests electron transfer from the molecule to Al_n^+.4.The scattering of (C_6F_6)_n^- and Al_n^- from a silicon surface was studied. The size distribution of fragment ions revealed electron transfer between the cluster and the surface. The recoil velocity dependent on the fragment size suggests multiple collision due to the many-body nature of the clusters.5.A Rutherford backscattering experiment was proposed to investigate the interaction between a surface and a cluster ion in the high-energy regime. A preliminary experiment was performed with He^+.On the basis of the above studies, we will start a project of cluster-cluster collision and clarify the mechanisms of many-body reactions involved in these dynamical processes.

我们已经研究了以下涉及簇的碰撞反应，以阐明多体过程的机制。这项研究是在德国Bielefeld的H. O. Lutz教授的联合研究中进行的。1。研究了分子（氩和甲醇）和金属（钠）簇离子与稀有气体原子的碰撞诱导的反应。在分子簇中，观察到高效的内部激发，这是通过目标原子与仅一个组成分子的相互作用来解释的。在金属簇中，内部激发的效率较低，解离过程取决于簇的大小。2。当簇与高能量离子碰撞时，形成了多电荷的集群离子，从而通过库仑爆炸解离。我们开发了一种方法，这些方法从片段离子的空间和速度分布中推论了初始簇的结构和解离动力学。3。研究了金属簇Al_n^+与有机分子异戊二烯的反应。吸附性的大小依赖性与Al_n的电离电位密切相关。这一事实表明电子从分子转移到al_n^+。4。研究了（C_6F_6）_n^ - 和Al_n^ - 从硅表面的散射。碎片离子的尺寸分布揭示了簇和表面之间的电子转移。取决于碎片尺寸的后坐力速度表明由于群集的多体性质而导致多次碰撞。5.Arutherford进行了反向散射实验，以研究高能状况中的表面与簇离子之间的相互作用。使用HE^+进行了初步实验。根据上述研究，我们将启动集群群集碰撞的项目，并阐明这些动态过程中涉及的多体反应的机制。