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Calculated Energies of Hydrogen Bonds

B3LYPultrafine_cp/6-31+G**

Dimer H Donor H Acceptor comment
H2OH2CO water formaldehyde dimer H2O Water H2CO Formaldehyde

Energy components

Dimer Donor Acceptor difference
Energy (hartrees) -190.951872 -76.434049 -114.511525 0.006298 16.5  kJ mol-1
Vibrational zero point energy (cm-1) 10792 4498 5635 -660 -7.9  kJ mol-1
Total         8.6  kJ mol-1