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Calculated Energies of Hydrogen Bonds

PBEPBE/3-21G*

Dimer H Donor H Acceptor comment
H2OH2O water dimer H2O Water H2O Water

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -151.801629 -75.886477 -75.886477 0.028675 75.3  kJ mol-1
Vibrational zero point energy (cm-1) 9335 4012 4012 -1311 -15.7  kJ mol-1
Total         59.6  kJ mol-1