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Calculated Energies of Hydrogen Bonds

B3LYP/6-31G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -113.103295 -56.547948 -56.547948 0.007400 19.4  kJ mol-1
Vibrational zero point energy (cm-1) 15185 7278 7278 -628 -7.5  kJ mol-1
Total         11.9  kJ mol-1