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Calculated Energies of Hydrogen Bonds

QCISD/6-311G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -152.498545 -76.243316 -76.243316 0.011912 31.3  kJ mol-1
Vibrational zero point energy (cm-1) 9968 4567 4567 -834 -10.0  kJ mol-1
Total         21.3  kJ mol-1