含杂质无格点基底表面分枝状凝聚体的计算机模拟

根据含杂质熔融玻璃表面金原子凝聚的实验规律，在原子团簇具有随机的线扩散步长和刚性 转动角度的特征条件下，建立了含杂质无格点基底表面的各向异性团簇-团簇凝聚模型，对 团簇的无规扩散、刚性转动以及凝聚全过程进行了计算机模拟，系统地研究了基底表面无规 分布的杂质区域对分枝状凝聚体诸多特性的影响，所得结果与实验事实相符合. 关键词： 薄膜生长 Monte Carlo模拟 分形

Computer simulation for ramified aggregates on nonlattice substrates with impurities

According to the experimental results of Au atomic aggregaties on molten glass surfaces with impurities, based on the characteristic assumption that clusters diffuse with random diffusion steps and rigid rotation angles, an improved restricted cluster_cluster aggregation model for nonlattice substrates with impurities is established. Then the whole diffusion,rotation and aggregation processes of the clusters are simulated. The impurities are distributed on the nonlattice substrate ramdomly, and its influence on the properties of the ramified aggregates is studied systematically .The simulation data are in good agreement with the experimental results.