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Calculated Energies of Hydrogen Bonds

B3LYP/CEP-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -34.356559 -17.173295 -17.173295 0.009969 26.2  kJ mol-1
Vibrational zero point energy (cm-1) 9797 4510 4510 -777 -9.3  kJ mol-1
Total         16.9  kJ mol-1