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- W2019832290 endingPage "064304" @default.
- W2019832290 startingPage "064304" @default.
- W2019832290 abstract "We present a detailed theoretical investigation on the dissociation energy of CuO+, carried out by means of coupled cluster theory, the multireference averaged coupled pair functional (MR-ACPF) approach, diffusion quantum Monte Carlo (DMC), and density functional theory (DFT). At the respective extrapolated basis set limits, most post-Hartree–Fock approaches agree within a narrow error margin on a De value of 26.0 kcal mol−1 [coupled-cluster singles and doubles level augmented by perturbative triples corrections, CCSD(T)], 25.8 kcal mol−1 (CCSDTQ via the high accuracy extrapolated ab initio thermochemistry protocol), and 25.6 kcal mol−1 (DMC), which is encouraging in view of the disaccording data published thus far. The configuration-interaction based MR-ACPF expansion, which includes single and double excitations only, gives a slightly lower value of 24.1 kcal mol−1, indicating that large basis sets and triple excitation patterns are necessary ingredients for a quantitative assessment. Our best estimate for D0 at the CCSD(T) level is 25.3 kcal mol−1, which is somewhat lower than the latest experimental value (D0 = 31.1 ± 2.8 kcal mol−1; reported by the Armentrout group) [Int. J. Mass Spectrom. 182/183, 99 (1999)]. These highly correlated methods are, however, computationally very demanding, and the results are therefore supplemented with those of more affordable DFT calculations. If used in combination with moderately-sized basis sets, the M05 and M06 hybrid functionals turn out to be promising candidates for studies on much larger systems containing a [CuO]+ core." @default.
- W2019832290 created "2016-06-24" @default.
- W2019832290 creator A5001279277 @default.
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- W2019832290 creator A5046788888 @default.
- W2019832290 creator A5061721957 @default.
- W2019832290 creator A5068099743 @default.
- W2019832290 date "2011-02-14" @default.
- W2019832290 modified "2023-10-01" @default.
- W2019832290 title "Quantum chemical assessment of the binding energy of CuO<sup>+</sup>" @default.
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