DYNAMICS OF CLUSTER-SURFACE COLLISIONS
DYNAMICS OF CLUSTER-SURFACE COLLISIONS
复制标题
DOI：
10.1126/science.257.5068.355
复制
发表时间：
1992-07-17
期刊：
影响因子：
56.9
通讯作者：
LANDMAN, U
中科院分区：
文献类型：
--
作者：
CLEVELAND, CL;LANDMAN, U
通过分子动力学模拟，对一个由561个原子组成的氩团簇以每秒3公里的速度撞击氯化钠表面时在纳米团簇中产生的冲击条件的结构、能量学和动力学进行了研究。撞击时发生的“堆积”冲击现象，连同能量和动量传递过程的级联以及团簇内部物质的惯性约束，产生了一种持续约一皮秒的瞬态介质，其特征是具有极高的局部密度、压力和动力学温度。在新形成的压缩非平衡环境中，纳米冲击条件和相互作用的脉冲性质为研究通过团簇撞击催化的化学反应性和动力学开辟了途径。
The structure, energetics, and dynamics of shock conditions generated in a nano-cluster upon impact on a crystalline surface are investigated with molecular-dynamics simulations for a 561-atom argon cluster incident with a velocity of 3 kilometers per second onto a sodium chloride surface. The "piling-up" shock phenomenon occurring upon impact, coupled with cascades of energy and momentum transfer processes and inertial confinement of material in the interior of the cluster, creates a transient medium lasting for about a picosecond and characterized by extreme local density, pressure, and kinetic temperature. The nano-shock conditions and impulsive nature of interactions in the newly formed compressed nonequilibrium environment open avenues for studying chemical reactivity and dynamics catalyzed via cluster impact.