The interaction energy of two water molecules is evaluated at several levels of theory in a better than double zeta plus polarization basis set. Our CCSD+T(CCSD) results should be quite close to the full CI result in this case. Results are compared with variation–perturbation results for the dispersion energy. Counterpoise-corrected correlated results are used to examine the importance of basis set superposition effects in this system.
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Harrison et al. (1986) studied this question.
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