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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Internal vibrations of the Li(NH3)(4)(+) complex analyzed from ab initio, density functional theory, and the classical spring network model
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Internal vibrations of the Li(NH3)(4)(+) complex analyzed from ab initio, density functional theory, and the classical spring network model

机译:从头算,密度泛函理论和经典弹簧网络模型分析Li(NH3)(4)(+)配合物的内部振动

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摘要

We report our theoretical findings regarding internal vibrations of the Li(NH3)(4)(+) complex which have been studied using three different methods, namely, a classical spring network model, density functional theory, and ab initio Hartree-Fock plus Moller-Plesset correlation energy correction truncated at second-order. The equilibrium Li center dot center dot center dot N and N center dot center dot center dot N distances are found to be 2.12 and 3.47 angstrom, respectively, in good agreement with the experimental data. The theoretically determined vibrational frequencies of the lowest modes are in good agreement with those extracted from inelastic X-ray scattering measurements. From group theory considerations, the internal vibrations of Li(NH3)(4)(+) complexes resemble those of a tetrahedral object. Further experimental investigation is suggested.
机译:我们报告有关Li(NH3)(4)(+)配合物内部振动的理论发现,已使用三种不同的方法进行了研究,即经典弹簧网络模型,密度泛函理论和从头算起Hartree-Fock plus Moller -Plesset相关能量校正在二阶处被截断。发现平衡Li中心点中心点中心点N和N中心点中心点中心点N的距离分别为2.12和3.47埃,与实验数据良好吻合。从理论上确定的最低模式的振动频率与从非弹性X射线散射测量中提取的振动频率非常一致。从组理论考虑,Li(NH3)(4)(+)配合物的内部振动类似于四面体的内部振动。建议进一步的实验研究。

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