Observation of a Universal Aggregation Mechanism and a Possible Phase Transition in Au Sputtered by Swift Heavy Ions
| Autor: | Kuiri, P. K., Joseph, B., Lenka, H. P., Sahu, G., Ghatak, J., Kanjilal, D., Mahapatra, D. P. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys Rev Lett 100, 245501 (2008) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.100.245501 |
| Popis: | Two exponents, $\delta$, for size distribution of $n$-atom clusters, $Y(n)\sim n^{-\delta}$, have been found in Au clusters sputtered from embedded Au nanoparticles under swift heavy ion irradiation. For small clusters, below 12.5 nm in size, $\delta$ has been found to be 3/2, which can be rationalized as occurring from a steady state aggregation process with size independent aggregation. For larger clusters, a $\delta$ value of 7/2 is suggested, which might come from a dynamical transition to another steady state where aggregation and evaporation rates are size dependent. In the present case, the observed decay exponents do not support any possibility of a thermodynamic liquid-gas type phase transition taking place, resulting in cluster formation. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
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