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51.
基于群论和量子力学计算,导出UC气体的基电子状态为3Π,其平衡核间距和离解能,分别为0.1852nm和4.5470eV。同时,用量子力学的MP2方法计算得到势能曲线,由此导出基电子状态的Murrell-Sorbie势能函数,并计算出能量,光谱和热力学性质,气态UC(X3Π)的标准生成烩ΔHf为808.06J/mol,定容热容Cp为31.288J/mol,绝对熵S为235.76J/mol.K。 相似文献
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用相对论有效原子实势(RECP)和密度泛函方法(B3LYP),采用U和Pu原子的紧缩价基集合[5s4p3d4f]/[3s3p2d2f],优化了U2和Pu2分子的平衡结构,得到它们的长键长(LBL)和短键长(SBL)分别为:U2分子是0.38965和0.29927 nm,Pu2分子是0.45375和0.35202 nm;导出了基态和最低激发态的势能函数,计算出它们的力常数、光谱数据和离解能. 相似文献
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The equilibrium geometries and the atomization energies of Cu_n(n≤9) clusters have been calculated using the B3LYP/LANL2DZ method. It is shown that the clusters do not copy the bulk structures and undergo significant geometrical changes with size and the atomization energy per atom increases monotonically with size. By analysing the energy level distribution, the Fermi level, HOMO-LUMO gaps, the electron affinities and the ionization potentials are calculated and the results are in reasonable agreement with experiment. These electronic properties are found to be strongly structure dependent, which can be used to determine which of the low-lying structures is observed experimentally. 相似文献
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A systematic study on the structure and electronic properties of gold clusters doped each with one copper atom has been performed using the density functional theory. The average bond lengths in the Aun-1Cu (n ≤ 9) bimetallic clusters are shorter than those in the corresponding pure gold clusters. The ionization potentials of the bimetallic clusters Aun-1Cu (n 〈 9) are larger than those of the corresponding homoatomic gold clusters except for Aus. The energy gaps of the Au-Cu binary clusters are narrower than those of the Aun clusters except AuCu and Au3Cu. No obvious even-odd effect exists in the variations of the electron affinities and ionization potentials for the Aun-1Cu (n ≤ 9) clusters, which is in contrast to the case of gold clusters Aun. 相似文献
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Our theoretical study on UH^{2+}( X^4Σ) using a density functional method shows that its potential energy curve has both minimum and maximum, which is the so-called "energy trapped" molecules. This sort of potential maximum is mainly caused by Coulomb repulsion. We have proposed the perturbation effect of ionic charges to explain the existence of the potential maximum for diatomic ions, and derived an analytic potential energy function has been derived, and the force constants and spectroscopic data are obtained. Finally, the vertical ionization potential for UH^{2+} has been calculated as well. 相似文献
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