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首页> 外文期刊>International Journal of Quantum Chemistry >BSSE-Free Description of Intermolecular Force Constants in Hydrogen Fluoride and Water Dimers
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BSSE-Free Description of Intermolecular Force Constants in Hydrogen Fluoride and Water Dimers

机译:不含BSSE的氟化氢和二聚体分子间力常数描述

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摘要

Theoretical studies have been performed to calculate the force constants and harmonic vibrational frequencies in the hydrogen fluoride and water dimers. The calculations have been undertaken both at the Hartree-Fock and correlated (second-order Moller-Plesset perturbation theory) levels of theory using several different basis sets ranging from the weak to the intermediate. The basis set superposition error (BSSE) has been excluded by using the chemical Hamiltonian approach. The results show that the BSSE influence is significant in the force constants and harmonic vibrational frequencies even if electron correlation is accounted for, so removing the BSSE is important. The results are compared with those obtained by the basis independent density-functional tight-binding method.
机译:已经进行了理论研究,以计算氟化氢和水二聚体中的力常数和谐波振动频率。计算是在Hartree-Fock和相关的(二阶Moller-Plesset微扰理论)理论水平上进行的,使用了从弱到中等的几种不同基础集。通过使用化学哈密顿方法已排除了基集叠加误差(BSSE)。结果表明,即使考虑了电子相关性,BSSE对力常数和谐波振动频率的影响也很大,因此消除BSSE至关重要。将结果与通过基本独立的密度泛函紧密结合方法获得的结果进行比较。

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