Complete analysis of the Na3+ fragmentation in collision with He atoms
摘要:
An experimental investigation of the fragmentation mechanisms of Na-3(+) cluster ions in collision with He atoms at 263 eV centre-of-mass energy is presented. The relative populations of the three fragmentation pathways are determined. In particular, the kinematics of the three-body breakup is studied in detail. The analysis of the correlation between the velocity vectors of the fragments allows one to estimate the relative role of the electronic excitation or momentum transfer in the population of each pathway. The discussion of the fragmentation dynamics is based on a concomitant theoretical study. (C) 1999 Elsevier Science B.V. All rights reserved.
post-collisional fragmentation of the excited cluster. Four simple fragmentation mechanisms are proposed to describe the major features of the process. Contributions of these mechanisms to different fragmentation pathways are determined and their dependence on the initial internal energy of the cluster is studied. Fragmentation intensity maps are calculated and good agreement with experiment is obtained
使用较早开发的理论程序研究了快速 He 原子激发后 Na3+ 簇离子碎裂的过程。与 He 的碰撞使 Na3+ 处于三种电子状态中的任何一种,并且这些电子状态中的每一种都可以分裂成三个产物通道(Na2++Na、Na2+Na+ 和 Na+Na+Na+)。注意力集中在了解 Na3+-He 相互作用的动力学和激发簇的碰撞后碎裂。提出了四种简单的碎片机制来描述该过程的主要特征。确定了这些机制对不同碎片途径的贡献,并研究了它们对簇初始内部能量的依赖性。计算了破碎强度图,并获得了与实验良好的一致性。