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Calculated Energies of Hydrogen Bonds

QCISD/6-311G*

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

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -112.798038 -56.395214 -56.395214 0.007611 20.0  kJ mol-1
Vibrational zero point energy (cm-1) 15428 7407 7407 -614 -7.3  kJ mol-1
Total         12.6  kJ mol-1