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Atom-Based Strong Correlation Method: An Orbital Selection Algorithm
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-11-14 00:00:00 , DOI: 10.1021/acs.jpca.7b08482
Aaron C. West 1
Affiliation  

The present study proposes a methodology that advances the selection of initial orbitals for subsequent use in correlation calculations. The initial orbital sets used herein are split-localized orbitals that span a full-valence orbital space and were developed in a previous study ( J. Chem. Phys. 2013, 139, 234107) in order to reveal the bonding patterns of molecules in a specific, quantitative manner. On the basis of the quantitative chemical features of these localized orbitals, this new method systematically extracts orbital sets and assigns excitation levels that systematically recover strong correlation with smaller numbers of configurations than can be achieved with traditional as well as nontraditional correlation methods. Moreover, this method not only provides organized initial orbitals for correlation calculations but also results in compact configuration interaction expansions via the use of the split-localized orbitals.

中文翻译:

基于原子的强相关方法:一种轨道选择算法

本研究提出了一种方法,该方法可以提高初始轨道的选择,以便随后在相关计算中使用。本文所用的初始轨道集是分割轨道的局部跨越全价轨道的空间和在先前的研究(被开发J.化学物理。 2013139(234107),以特定,定量的方式揭示分子的键合模式。根据这些局部轨道的定量化学特征,该新方法系统地提取了轨道集并分配了激发水平,从而以比常规和非传统相关方法更少的构型,系统地恢复了强相关性。而且,该方法不仅提供用于相关性计算的有组织的初始轨道,而且通过使用分裂局部化的轨道导致紧凑的配置相互作用扩展。
更新日期:2017-11-14
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