Investigation of Many Body Effect in Cluster Collisions
Grant-in-Aid for Overseas Scientific Survey.
|Research Institution||The University of Tokyo|
TERASAKI Akira The University of Tokyo, Graduate School of Science, Research Associate, 大学院理学系研究科, 助手 (60222147)
野々瀬 真司 東京大学, 大学院理学系研究科, 助手 (70212131)
LUTZ Hans O. Universitat Bielefeld, Department of Physics, Professor, Department of Phys, Professor
近藤 保 東京大学, 大学院理学系研究科, 教授 (10011610)
NONOSE Shinji The University of Tokyo, Graduate School of Science, Research Associate
KONDOW Tamotsu The University of Tokyo, Graduate School of Science, Professor
|Project Fiscal Year
1993 – 1993
Completed(Fiscal Year 1993)
|Keywords||Cluster / Collision-Induced Reaction / Dissociation / Surface Scattering / Many-Body Effect / Coulomb Explosion / Rutherford Backscattering / クラスター / 衝突反応 / 解離反応 / 吸着反応 / 表面散乱 / 多体効果 / クーロン爆発 / ラザフォード後方散乱|
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.
Research Output (8results)