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• W3195063483 abstract "The binding energies, structures, and vibrational frequencies of water clusters up to 20 molecules are computed at the direct random phase approximation (RPA) level of theory and compared to theoretical benchmarks. Binding energies of the WATER27 set, which includes neutral and positively and negatively charged clusters, are predicted to be too low in the complete basis set limit by an average of 7 kcal/mol (9%) and are worse than the results from the best density functional theory methods or from the Møller–Plesset theory. The RPA shows significant basis set size dependence for binding energies. The order of the relative energies of the water hexamer and dodecamer isomers is predicted correctly by the RPA. The mean absolute deviation for angles and distances for neutral clusters up to the water hexamer are 0.2° and 0.6 pm, respectively, using quintuple-ζ basis sets. The relative energetic order of the hexamer isomers is preserved upon optimization. Vibrational frequencies for these systems are underestimated by several tens of wavenumbers for large basis sets, and deviations increase with the basis set size. Overall, the direct RPA method yields accurate structural parameters but systematically underestimates binding energies and shows strong basis set size dependence." @default.
• W3195063483 created "2021-08-30" @default.
• W3195063483 creator A5001809942 @default.
• W3195063483 creator A5023987211 @default.
• W3195063483 creator A5043847716 @default.
• W3195063483 date "2021-08-25" @default.
• W3195063483 modified "2023-09-27" @default.
• W3195063483 title "Energies, structures, and harmonic frequencies of small water clusters from the direct random phase approximation" @default.
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