Density-functional thermochemistry. III. The role of exact exchange

Journal of Chemical Physics - Tập 98 Số 7 - Trang 5648-5652 - 1993
Axel D. Becke1
1Department of Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6

Tóm tắt

Despite the remarkable thermochemical accuracy of Kohn–Sham density-functional theories with gradient corrections for exchange-correlation [see, for example, A. D. Becke, J. Chem. Phys. 96, 2155 (1992)], we believe that further improvements are unlikely unless exact-exchange information is considered. Arguments to support this view are presented, and a semiempirical exchange-correlation functional containing local-spin-density, gradient, and exact-exchange terms is tested on 56 atomization energies, 42 ionization potentials, 8 proton affinities, and 10 total atomic energies of first- and second-row systems. This functional performs significantly better than previous functionals with gradient corrections only, and fits experimental atomization energies with an impressively small average absolute deviation of 2.4 kcal/mol.

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Thông tin
Thông tin xuất bản

Journal of Chemical Physics

Tập 98 Số 7

5648-5652

Thông tin tác giả