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Calculated Energies of Hydrogen Bonds

MP2_cp_opt/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) -190.433317 -76.233108 -114.192626 0.007582 19.9  kJ mol-1
Vibrational zero point energy (cm-1) 10745 4469 5637 -639 -7.6  kJ mol-1
Total         12.3  kJ mol-1