Embedding and atomic orbitals hybridization

Embedding and atomic orbitals hybridization
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嵌入和原子轨道杂化

DOI:
10.1002/qua.22820
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发表时间:
2010
影响因子:
2.2
通讯作者:
Abarenkov I
Abarenkov I
中科院分区:
化学3区
文献类型:
--
作者:
Abarenkov I

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在计算晶体的电子结构,特别是含点缺陷的晶体的电子结构时,证明了嵌入方法的有效性和方便性。在这种方法中,考虑了晶体的有限部分,称为团簇,而不是无限晶体,并用嵌入势来模拟晶体其余部分的影响。该方法的关键问题是簇的选择和嵌入势的产生。为了选择簇,在本方法中使用Wigner-Seitz单胞,并且在共享该原子的相邻单胞之间对称地划分位于单胞表面、边缘或顶点的每个边界原子。原子杂化轨道用于相邻团簇之间的边界原子划分。结果表明,与传统的杂化方案相反,非正交甚至线性相关的原子杂化轨道可以用来构造边界原子密度矩阵。这个密度矩阵可以满足适当的点对称性,并与等效杂化轨道的数目和最近邻的数目相匹配。本文考虑了边界原子对应的两种不同类型的嵌入势(单中心和多中心)。作为边界原子的一个特例,我们考虑了氧化锆、氧化镁和二氧化钛金红石晶体中的氧离子。2010Wiley期刊公司Int J Quantum Chem,2011
In calculation, the electronic structure of crystals, especially those containing point defects, the embedding approach is proved to be useful and convenient. In this approach, a finite part of the crystal, referred to as cluster, is considered instead of infinite crystal and the influence of the rest of the crystal is simulated by the embedding potential. The key problems of this approach are the cluster selection and the embedding potential generation. To select a cluster, the Wigner‐Seitz unit cell is used in the present approach and every border atom, situated at the unit cell face, edge, or vertex is symmetrically “divided” among adjacent unit cells sharing this atom. The atomic hybrid orbitals are used for the border atoms partition between neighboring clusters. It is shown that contrary to the conventional hybridization scheme, the nonorthogonal and even linearly dependent atomic hybrid orbitals can be used to construct the border atom density matrix. This density matrix can be made to satisfy the proper point symmetry and to match the number of equivalent hybrid orbitals and the number of nearest neighbors. Two different types (one‐center and multicenters) of the embedding potential corresponding to the border atom are considered in the article. As a particular example of the border atom the oxygen ion in ZrO2, MgO, and TiO2rutile crystals is considered. © 2010 Wiley Periodicals, Inc. Int J Quantum Chem, 2011
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