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Calculated Energies of Hydrogen Bonds

B3LYPultrafine/6-311+G(3df,2pd)

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -113.179174 -56.587555 -56.587555 0.004064 10.7  kJ mol-1
Vibrational zero point energy (cm-1) 15045 7285 7285 -475 -5.7  kJ mol-1
Total         5.0  kJ mol-1