期刊
JOURNAL OF COMPUTATIONAL CHEMISTRY
卷 37, 期 27, 页码 2447-2453出版社
WILEY-BLACKWELL
DOI: 10.1002/jcc.24468
关键词
Green's function; F12 theory; ionization energies
资金
- MEXT [FLAGSHIP2020]
- Japan Society for the Promotion of Science (JSPS) [26810007]
- Grants-in-Aid for Scientific Research [26810007] Funding Source: KAKEN
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. (c) 2016 Wiley Periodicals, Inc.
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