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Calculated Energies of Hydrogen Bonds

QCISD/6-31G(2df,p)

Dimer H Donor H Acceptor comment
H2OH2O water dimer H2O Water H2O Water

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -152.563829 -76.276859 -76.276859 0.010112 26.5  kJ mol-1
Vibrational zero point energy (cm-1) 9804 4549 4549 -706 -8.4  kJ mol-1
Total         18.1  kJ mol-1