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Calculated Energies of Hydrogen Bonds

PBEPBE_cp/6-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -132.805707 -76.322481 -56.470493 0.012733 33.4  kJ mol-1
Vibrational zero point energy (cm-1) 12526 4465 7299 -761 -9.1  kJ mol-1
Total         24.3  kJ mol-1