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arXiv 1007.2151physics.atm-clus
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掺杂单个杂质原子的Lennard-Jones稀有气体团簇的熔化

Melting of Lennard-Jones rare gas clusters doped with a single impurity atom

Nicolás Quesada, Gloria E. Moyano

摘要:

在正则系综下,利用平行回火蒙特卡罗模拟研究了单个杂质对309原子团簇熔化过程的影响.熔化温度范围的降低是普遍的,尽管这种效果取决于杂质原子相对于簇大小的大小。此外,还应考虑杂质和团簇主要成分的原子尺寸之间的差异。我们表明,由于杂质的迁移的固-固转变变得明显,并明确区分从熔融到147个原子的簇大小。

英文摘要:

Single impurity effect on the melting process of magic number Lennard-Jones, rare gas, clusters of up to 309 atoms is studied on the basis of Parallel Tempering Monte Carlo simulations in the canonical ensemble. A decrease on the melting temperature range is prevalent, although such effect is dependent on the size of the impurity atom relative to the cluster size. Additionally, the difference between the atomic sizes of the impurity and the main component of the cluster should be considered. We demonstrate that solid-solid transitions due to migrations of the impurity become apparent and are clearly differentiated from the melting up to cluster sizes of 147 atoms.

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