Equilibrium molecular energies used to obtain molecular dissociation energies and heats of formation within the bond-order correlation approach

Details Equilibrium molecular energies used to obtain molecular dissociation energies and heats of formation within the bond-order correlation approach Equilibrium molecular energies used to obtain molecular dissociation energies and heats of formation within the bond-order correlation approach

2005-10-11

arxiv.org/abs/physics/0510091v1

Mol. Phys. 104 (2006) 453

Physics

Chemical Physics

Mol. Phys., to be published

Scientific paper

10.1080/00268970500404273

Ab initio calculations including electron correlation are still extremely costly except for the smallest atoms and molecules. Therefore, our purpose in the present study is to employ a bond-order correlation approach to obtain, via equilibrium molecular energies, molecular dissociation energies and heats of formation for some 20 molecules containing C, H, and O atoms, with a maximum number of electrons around 40. Finally, basis set choice is shown to be important in the proposed procedure to include electron correlation effects in determining thermodynamic properties. With the optimum choice of basis set, the average percentage error for some 20 molecules is approximately 20% for heats of formation. For molecular dissociation energies the average error is much smaller: ~0.4.

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