Explicitly correlated frequency-independent second-order green's function for accurate ionization energies

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• 作者：Yu-ya Ohnishi and Seiichiro Ten-no
• 刊名：Journal of Computational Chemistry
• 出版年：2016
• 出版时间：October 15, 2016
• 年：2016
• 卷：37
• 期：27
• 页码：2447-2453
• 全文大小：616K
• ISSN：1096-987X

文摘

Explicitly correlated second-order Green's function (GF2-F12) is presented and applied to polycyclic aromatic hydrocarbons (PAHs), oligothiophene, and porphyrins. GF2 suffers from slow convergence of orbital expansions as in the ordinary post Hartree–Fock methods in ab initio theory, albeit the method is capable of providing quantitatively accurate ionization energies (IE) near the complete basis set limit. This feature is significantly mitigated by introducing F12 terms of explicitly correlated electronic structure theory. It is demonstrated that GF2-F12 presents accurate IE with augmented triple-zeta quality of basis sets. The errors from experimental results are typically less than 0.15 eV for PAHs.