Approaching the Hartree-Fock Limit through the Complementary Auxiliary Basis Set Singles Correction and Auxiliary Basis Sets.

Approaching the Hartree-Fock Limit through the Complementary Auxiliary Basis Set Singles Correction and Auxiliary Basis Sets.
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通过互补辅助基组单数校正和辅助基组逼近 Hartree-Fock 极限。

DOI:
10.1021/acs.jctc.7b00140
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发表时间:
2017
影响因子:
5.5
通讯作者:
Shaw RA
Shaw RA
中科院分区:
化学1区
文献类型:
--
作者:
Shaw RA

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对于元素H-Ar,提出了用于显式相关方法中恒等式(RI)近似解析的辅助基集。它们通过添加少量的S函数和p函数来扩展Peterson和同事的cc-pVnZ-F12/OptRI(n=D-Q)辅助基组,并对其进行优化,以产生对Hartree-Fock能量的最大互补辅助基组(CABS)单校正。新的集合,表示为OptRI+,也导致了由于RI近似而导致的误差的减少,从而改善了关联能量。在CCSD(T)-F12b水平上计算的一组小分子的原子化能和生成热,以及27个双原子化合物的光谱常数,在几乎不增加额外工作量的情况下,改善了新辅助基组的误差分布。OptRI+Sets保留了原始OptRI的所有理想属性,包括产生平滑的势能面,同时保持紧凑的性质。
Auxiliary basis sets for use in the resolution of the identity (RI) approximation in explicitly correlated methods are presented for the elements H–Ar. These extend the cc-pVnZ-F12/OptRI (n= D–Q) auxiliary basis sets of Peterson and co-workers by the addition of a small number of s- and p-functions, optimized so as to yield the greatest complementary auxiliary basis set (CABS) singles correction to the Hartree–Fock energy. The new sets, denoted OptRI+, also lead to a reduction in errors due to the RI approximation and hence an improvement in correlation energies. The atomization energies and heats of formation for a test set of small molecules, and spectroscopic constants for 27 diatomics, calculated at the CCSD(T)-F12b level, are shown to have improved error distributions for the new auxiliary basis sets with negligible additional effort. The OptRI+ sets retain all of the desirable properties of the original OptRI, including the production of smooth potential energy surfaces, while maintaining a compact nature.
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