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利用计算机模拟了超薄膜中分形凝聚体的生长 ,考虑了薄膜生长过程中的团簇扩散和旋转。开始的团簇生长采用不同允许扩散步长下准圆形团状生长的分子动力学模型。研究了基底上分形凝聚体中团簇的扩散和旋转对表面形貌的影响 ,引进了团簇的扩散和旋转因子。结果表明 :初始的小团簇经过无规则的扩散和旋转逐渐凝聚成具有分支状的凝聚体。团簇的旋转对分形结构的维数值没有太大的影响。
The growth of fractal aggregates in ultrathin films was simulated by computer, taking into account the diffusion and rotation of the clusters during the film growth. The initial cluster growth uses different molecular dynamics models that allow for quasi-circular clump growth under diffusion steps. The effects of the diffusion and rotation of the clusters in the fractal aggregate on the surface topography were investigated, and the diffusion and rotation factors of the clusters were introduced. The results show that the initial small clusters gradually aggregate into branch-like aggregates by random diffusion and rotation. The rotation of the cluster does not have much effect on the dimensionality of the fractal structure.