It is shown that the singlet and triplet transition energies of hydrocarbons may be calculated by means of the generalised Mataga-Nishimoto approximation for the two-center Coulomb integrals.
On the use of a model function of Coulomb hole approximation for evaluation of the Coulomb integrals in semiempirical SCF MO methods
β Scribed by M.J. Filatov; I.L. Zilberberg; G.M. Zhidomirov
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 273 KB
- Volume
- 73
- Category
- Article
- ISSN
- 0010-4655
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β¦ Synopsis
In order to evaluate the Coulomb and exchange integrals in the semiempirical SCF MO methods over an spd-basis of orbitals, an approximation of the model function of the Coulomb hole is used. The procedure of calculating mono-and bicentric Coulomb integrals based on the properties of Fourier transform is developed.
π SIMILAR VOLUMES
Simple final formulae are obtained for the normalization factors of wavefunctions for bound states in a one-dimensional, single-well potential, when use is made of certain arbitrary-order phase-integral approximations, which may be modified in a convenient way.