arXivDaily arXiv每日学术速递 周一至周五更新
arXiv physics/0601209physics.chem-phphysics.atm-clus
收藏

H5 +分子振动光谱的量子Monte Carlo模拟

Vibrational spectrum of the H5+ molecule using quantum Monte Carlo

Washington Barbosa da Silva, Luiz Roncaratti, Geraldo Magela e Silva, Paulo Hora Acioli

摘要:

本文采用关联函数量子蒙特卡罗方法(CFQMC)对H ~(5+)分子的振动光谱进行了表征,并采用遗传算法对所用的势能面的拓扑结构进行了研究。与H_3 ~+ -H_2的扭转和伸缩有关的振动模具有非常平坦的极小值。因此,对应于这些模式的基频在谐波近似中描述得很差。在这项工作中获得的振动频率与现有的实验数据以及文献中发现的其他计算方法吻合得很好。在我们的遗传算法研究的势能面,使用carnival坐标,我们发现了一些意想不到的最小值。仔细的分析表明,这些最小值中的一些是由相同的curviliniar坐标,其中的潜力是描述。然而,它们代表不等价的分子几何形状。

英文摘要:

In this article we present a caracterization of the vibrational spectrum of the H5+ molecule using the correlation function quantum Monte Carlo (CFQMC) method and a genetic algorithm study of the topology of the potential energy surface used in this work. The vibrational modes associated with the H3+ - H2 torsion and stretching posses very flat minima. As a consequence the fundamental frequencies corresponding to these modes are poorly described in the harmonic approximation. The vibrational frequencies obtained in this work are in good agreement with the available experimental data as well as other computational methods found in literature. In our genetic algorithm study of the potential energy surface using cartesian coordinates we have found some unexpected minima. A careful analysis shows that some of these minima are described by the same curviliniar coordinates in which the potential is described. However, they represent nonequivalent molecular geometries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑