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Non-Hamiltonian molecular dynamics implementation of the Gibbs ensemble method. II. Molecular liquid-vapor results for carbon dioxide

机译:Gibbs集成方法的非哈密顿分子动力学实现。二。二氧化碳的分子液汽结果

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The Gibbs ensemble molecular dynamics algorithm introduced in the preceding paper (paper I) [C. Bratschi and H. Huber, J. Chem. Phys. v 126, 164104 (2007)] is applied to two recently published CO2 ab initio pair potentials, the Bock-Bich-Vogel and symmetry-adapted perturbation theory site-site potentials. The critical properties of these potentials are calculated for the first time. Critical values and points in the single and two-phase zones are compared with Monte Carlo results to demonstrate the accuracy of the molecular dynamics algorithm, and are compared with experiment to test the accuracy of the potentials. Pressure calculations in the liquid, gas, and supercritical states are carried out and are used to explain potential-related effects and systematic discrepancies. The best ab initio potential yields results in good agreement with experiment. (c) 2007 American Institute of Physics.
机译:前一篇论文(论文I)介绍了Gibbs集成分子动力学算法[C. Bratschi和H.Huber,《化学杂志》物理v 126,164104(2007)]适用于两个最近发布的CO2从头算对电位,即Bock-Bich-Vogel和对称自适应扰动理论的位点-位点电位。这些电势的关键特性是第一次计算。将单相和两相区的临界值和临界点与蒙特卡洛结果进行比较,以证明分子动力学算法的准确性,并与实验进行比较,以测试电势的准确性。进行了液体,气体和超临界状态下的压力计算,并用于解释潜在的影响和系统差异。最佳的从头算潜在产量与实验有很好的一致性。 (c)2007年美国物理研究所。

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