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Calculated Energies of Hydrogen Bonds

QCISD/6-31+G**

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -112.819603 -56.406830 -56.406830 0.005944 15.6  kJ mol-1
Vibrational zero point energy (cm-1) 15125 7297 7297 -531 -6.3  kJ mol-1
Total         9.3  kJ mol-1