反应限制聚集模型的动力学行为的研究

根据反应限制聚集（reaction limited aggregation, RLA）模型,研究表面活性剂存在时 的薄膜外延生长动力学过程. 研究结果表明,在二维岛的生长初期,分形岛与紧致岛具有不 同的岛密度和“死”原子密度（岛的相对总面积）增长方式：分形岛密度随覆盖率生长指数 小于1,紧致岛密度的生长指数大于1;分形岛相对总面积随覆盖率线性增长,紧致岛相对总 面积随覆盖率非线性增长. 关键词： 反应限制聚集模型 岛密度 “死”原子密度

Studies on dynamical behavior in reaction limited aggregation model

Based on reaction limited aggregation model, we have investigated the dynamical process of film epitaxial growth in the presence of surfactant. The results ind icate that there are differences between the growth processes of fractal island and compact island. The growth exponents of fractal islands are greater than 1, which that of compact islands are less than 1. On the other hand, “dead" atom d ensity increases linearly with the coverage in the process of the fractal island growth, but the relations between the density and the coverage are nonlinear in the compact island situation.