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Calculated Energies of Hydrogen Bonds

PBEPBE/6-31G

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -112.919609 -56.454272 -56.454272 0.011064 29.0  kJ mol-1
Vibrational zero point energy (cm-1) 15275 7214 7214 -846 -10.1  kJ mol-1
Total         18.9  kJ mol-1