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Calculated Energies of Hydrogen Bonds

B3LYPultrafine/6-31G*

Dimer H Donor H Acceptor comment
H2ONH3 Water Ammonia Dimer H2O Water NH3 Ammonia

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -132.970443 -76.408954 -56.547948 0.013541 35.6  kJ mol-1
Vibrational zero point energy (cm-1) 12466 4452 7261 -754 -9.0  kJ mol-1
Total         26.5  kJ mol-1