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- W2004672669 abstract "The C2v and Cs ground and low-lying states of doublet CuO2 are examined for a series of different density functionals (pure, hybrid, and meta-hybrid) and CCSD(T) methods. The effect of changing the B3LYP functional a0 parameter is also explored. CCSD(T) results at the complete basis set limit show that the relative stability of the different electronic states is 2A2(C2v) < 2A′′(Cs) < 2B2(C2v) < 2A′(Cs) ≪ 2A1(C2v) < 2B1(C2v). Unlike CCSD(T), all DFT methods analyzed in this work erroneously predict the end-on 2A′′ state as the ground state for CuO2 irrespective of the type of functional and percentage of Hartree−Fock (exact) exchange included in the B3LYP-like functional. Among the different functionals tested, B3LYP gives the best geometries and relative energies for the different electronic states when compared to CCSD(T) results. As for the effect of the a0 parameter, it is found that the B3LYP-like functional yielding better geometries contains 20% of exact exchange, although somewhat unexpectedly, the B3LYP-like functional with a larger contribution of exact exchange (90%) is the one that gives the smaller standard deviation for relative energies." @default.
- W2004672669 created "2016-06-24" @default.
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- W2004672669 creator A5079576086 @default.
- W2004672669 date "2009-01-15" @default.
- W2004672669 modified "2023-10-18" @default.
- W2004672669 title "Structure, Bonding, and Relative Stability of the Ground and Low-Lying Electronic States of CuO<sub>2</sub>. The Role of Exact Exchange" @default.
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