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Calculated Energies of Hydrogen Bonds

PBEPBE/6-311G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -112.987519 -56.488863 -56.488863 0.009794 25.7  kJ mol-1
Vibrational zero point energy (cm-1) 15429 7382 7382 -664 -7.9  kJ mol-1
Total         17.8  kJ mol-1