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Calculated Energies of Hydrogen Bonds

PBEPBEultrafine/6-31G**

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -152.679961 -76.333217 -76.333217 0.013527 35.5  kJ mol-1
Vibrational zero point energy (cm-1) 0 4515 4515 9030 108.0  kJ mol-1
Total         143.5  kJ mol-1