科研之友
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摘要
Calorimetry measurements have been performed as a function of temperature for size-selected Ga(n-1)Al(+) clusters with n = 17, 19, 20, 30-33, 43, 46, and 47. Heat capacities determined from these measurements are compared with previous results for pure Ga(n)(+) clusters. Melting transitions are identified from peaks in the heat capacities. Substituting an aluminum atom appears to have only a small effect on the melting behavior. For clusters that show melting transitions, the melting temperatures and latent heats for the Ga(n-1)Al(+) clusters are similar to those for the Ga(n)(+) analogs. For Ga(n)(+) clusters that do not show first-order melting transitions (n = 17, 19, and 30) the Ga(n-1)Al(+) analogs also lack peaks in their heat capacities. The results suggest that the aluminum atom is not localized to a specific site in the solid-like Ga(n-1)Al(+) clusters.
- 出版日期2007-8-23
