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arXiv physics/0003068physics.chem-ph
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38原子Lennard-Jones团簇的相变I:正则系综中的平行回火研究

Phase changes in 38 atom Lennard-Jones clusters. I: A parallel tempering study in the canonical ensemble

J. P. Neirotti, F. Calvo, David L. Freeman, J. D. Doll

摘要:

用平行回火蒙特卡罗方法计算了正则系综中38原子Lennard-Jones团簇的热容和同质异能态分布。一个独特的区域的温度被确定,对应于全球最小结构和二十面体盆地的结构之间的平衡。该温度区域出现在热容的熔融峰以下,并且伴随着热容对温度的导数中的峰。平行回火示出在不同温度下的结果之间的相关性。给出了一个讨论,比较平行回火与其他相关的方法,确保遍历模拟。

英文摘要:

The heat capacity and isomer distributions of the 38 atom Lennard-Jones cluster have been calculated in the canonical ensemble using parallel tempering Monte Carlo methods. A distinct region of temperature is identified that corresponds to equilibrium between the global minimum structure and the icosahedral basin of structures. This region of temperatures occurs below the melting peak of the heat capacity and is accompanied by a peak in the derivative of the heat capacity with temperature. Parallel tempering is shown to introduce correlations between results at different temperatures. A discussion is given that compares parallel tempering with other related approaches that ensure ergodic simulations.

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