| Popis: |
For submonolayer nucleation and growth of islands during metal (100) homoepitaxy, we precisely characterize transitions, with increasing temperature, in the critical size, i , above which islands are effectively stable. For strong adatom bonding, we demonstrate universal crossover behavior from i = 1 directly to a well-defined “ i = 3” regime where tetramers are stable, but not, e.g., pentamers. A criterion is also presented for the ultimate breakdown of “ i = 3” due to double-bond scission. Various transition temperatures and key energies are thereby determined for Ag, Cu, Fe, Ni and Pd. |
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