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Calculated Energies of Hydrogen Bonds

B3LYPultrafine/6-31G**

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -152.851500 -76.419737 -76.419737 0.012026 31.6  kJ mol-1
Vibrational zero point energy (cm-1) 0 4506 4506 9012 107.8  kJ mol-1
Total         139.4  kJ mol-1