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Calculated Energies of Hydrogen Bonds

B3LYP/6-31G(2df,p)

Dimer H Donor H Acceptor comment
NH3NH3 Ammonia Dimer NH3 Ammonia NH3 Ammonia

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -113.126744 -56.560246 -56.560246 0.006253 16.4  kJ mol-1
Vibrational zero point energy (cm-1) 15039 7277 7277 -484 -5.8  kJ mol-1
Total         10.6  kJ mol-1