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A study of the basis set dependence of the bifunctional expression of the non-interacting kinetic energy for atomic systems

机译:基于互动动能对原子系统的双功能表达的基础设定依赖性研究

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摘要

The non-interacting kinetic energy is divided into the von Weizsacker term and the Pauli kinetic energy. Whereas the von Weizsacker energy is known in terms of the density, the Pauli kinetic energy is not. Consequently, its functional derivative can only be determined formally, at the solution point, from a given set of Kohn-Sham eigenfunctions. Since in a practical calculation the solution point is never reached exactly, the formal functional derivative is evaluated only in proximity of the solution point. Therefore, bifunctional expressions involving the corresponding potential are approximate. In this study the atoms from H - Xe are examined, showing that the energy deviation between the bifunctional expression and the orbital-based kinetic energy density is of a few hundred millihartrees for a quadruple basis set, while it can reach the order of a few hartrees when employing basis sets of less quality.
机译:非相互作用的动能被分成冯威齐施客术语和Pauli动能。 虽然Von WeizSacker能量在密度方面是已知的,但是Pauli动能不是。 因此,其功能衍生物只能在溶液点中正式确定,来自给定的一组Kohn-Mhegenfunction。 由于在实际计算中,从未完全达到解决方案点,因此仅在解决方案点的附近评估正式的功能衍生物。 因此,涉及相应电位的双功能表达是近似的。 在这项研究中,检查了来自H-XE的原子,表明双功能表达和基于轨道基的动能密度之间的能量偏差为四十六厘米的套件,而这件可以达到几百毫升 采用基础较低的质量时的哈特。

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