Midbond basis functions for weakly bound complexes

Midbond basis functions for weakly bound complexes
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弱结合配合物的中键基函数

DOI:
10.1080/00268976.2018.1440018
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发表时间:
2018
期刊:
影响因子:
1.7
通讯作者:
Shaw R
Shaw R
中科院分区:
化学4区
文献类型:
--
作者:
Shaw R

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由于大的分离,弱束缚系统对于传统的以原子为中心的基组提出了一个难题,需要使用大型的、计算昂贵的基。这可以通过在复合物分子之间的区域放置少量功能来解决。我们为一系列涉及惰性气体、碱金属和小分子的配合物提供了紧凑的优化中键函数集,用于高精度耦合簇计算,以及更强大的优化程序。结果表明,当添加一些中间键功能时,双 zeta 质量轨道基组可以获得优异的结果,将一系列惰性气体二聚体的相互作用能和平衡键长分别提高 47% 和 8%。当与显式相关方法结合使用时,可以轻松实现接近完整的基组极限精度,而成本仅为使用大基组所需成本的一小部分。开发通用辅助集是为了允许进行明确相关的中键函数研究,从而可以对弱结合复合物进行非常高精度的计算。
Weakly bound systems present a difficult problem for conventional atom-centred basis sets due to large separations, necessitating the use of large, computationally expensive bases. This can be remedied by placing a small number of functions in the region between molecules in the complex. We present compact sets of optimised midbond functions for a range of complexes involving noble gases, alkali metals and small molecules for use in high accuracy coupled -cluster calculations, along with a more robust procedure for their optimisation. It is shown that excellent results are possible with double-zeta quality orbital basis sets when a few midbond functions are added, improving both the interaction energy and the equilibrium bond lengths of a series of noble gas dimers by 47% and 8%, respectively. When used in conjunction with explicitly correlated methods, near complete basis set limit accuracy is readily achievable at a fraction of the cost that using a large basis would entail. General purpose auxiliary sets are developed to allow explicitly correlated midbond function studies to be carried out, making it feasible to perform very high accuracy calculations on weakly bound complexes.
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