Abstract
The results of kinetic Monte Carlo simulations of a realistic model of postdeposition island growth that takes into account the spatial extent of islands are presented. Simulations were carried out on one- and two-dimensional substrates for different values of the critical island size i and were compared with previous results for a point-island model. The use of a realistic island geometry results in enhanced island aggregation and coalescence. This leads to an increase in the average island size S as well as the exponent z describing the dependence of S on coverage. The shape of the island-size distribution for $i=3$ also changes dramatically due to the existence of ``magic'' islands.
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