表面扩散的Monte　Carlo初探

Monte Carlo Simulations of Surface Diffusion

利用ＭｏｎｔｅＣａｒｌｏ方法模拟了理想表面和分形表面上的扩散过程；通过模拟可以发现，表面扩散系数不仅与表面浓度有关，而且还与扩散的时间、表面的几何形貌等有关。在表面覆盖度比较高时，表面扩散系数有一极大值。与理想表面相比，分形表面会使扩散系数减小。

The Monte Carlo method based on random walk was used to simulate surface diffusion processes on an ideal surface and a DLA fractal.By the simulations,it is found that the surface diffusivity is related not only to the surface coverage but also to the observation time and the surface geometry.There is a maximum of the surface diffusivity in high surface coverage.The fractal surface can reduce the surface diffusivity in comparison with the ideal surface.