热活化纳米团簇内聚head-on collisions的模拟
Simulation of cohesive head-on collisions of thermally activated nanoclusters
摘要：
数值研究了纳米团簇在热涨落作用下的碰撞现象。通过对两个相同团簇碰撞的分子动力学模拟发现，由于碰撞团簇的内聚相互作用和排斥相互作用之间的竞争，迎面碰撞的恢复系数在碰撞速度处有一个峰值.碰撞的某些方面可以通过Brilliantov { \it et al.}（Phys. Rev. E { \bf 76}，051302（2007）），但是从模拟中发现了许多新的方面。特别是，我们发现有一些反常的反弹，其中恢复系数大于1。回弹过程对冲击速度和内聚参数的相图可以通过简单的唯象学来理解。
英文摘要：
Impact phenomena of nanoclusters subject to thermal fluctuations are numerically investigated. From the molecular dynamics simulation for colliding two identical clusters, it is found that the restitution coefficient for head-on collisions has a peak at a colliding speed due to the competition between the cohesive interaction and the repulsive interaction of colliding clusters. Some aspects of the collisions can be understood by the theory by Brilliantov {\it et al.} (Phys. Rev. E {\bf 76}, 051302 (2007)), but many new aspects are found from the simulation. In particular, we find that there are some anomalous rebounds in which the restitution coefficient is larger than unity. The phase diagrams of rebound processes against impact speed and the cohesive parameter can be understood by a simple phenomenology.
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