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首页> 外文期刊>Journal of the Brazilian Chemical Society >Basis set convergence on static electric dipole polarizability calculations of alkali-metal clusters
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Basis set convergence on static electric dipole polarizability calculations of alkali-metal clusters

机译:碱金属团簇静电偶极极化率计算的基集收敛

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摘要

A hierarchical sequence of all-electron segmented contracted basis sets of double, triple and quadruple zeta valence qualities plus polarization functions augmented with diffuse functions for the atoms from H to Ar was constructed. A systematic study of basis sets required to obtain reliable and accurate values of static dipole polarizabilities of lithium and sodium clusters (n = 2, 4, 6 and 8) at their optimized equilibrium geometries is reported. Three methods are examined: Hartree-Fock (HF), second-order Mfller-Plesset perturbation theory (MP2), and density functional theory (DFT). By direct calculations or by fitting the directly calculated values through one extrapolation scheme, estimates of the HF, MP2 and DFT complete basis set limits were obtained. Comparison with experimental and theoretical data reported previously in the literature is done.
机译:构造了一个全电子分段的收缩基组的序列,该基组具有双价,三价和四价zeta价态质量以及极化函数,该极化函数具有从H到Ar的原子的扩散函数。报告了对在最佳平衡几何条件下获得锂和钠簇(n = 2、4、6和8)的静态偶极极化率的可靠和准确值所需的基础集的系统研究。研究了三种方法:Hartree-Fock(HF),二阶Mfller-Plesset微扰理论(MP2)和密度泛函理论(DFT)。通过直接计算或通过一种外推方案拟合直接计算的值,可以获得HF,MP2和DFT完整基准集限值的估计值。与先前文献中报道的实验和理论数据进行了比较。

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