By Ramon Carbo, Joseph M. Riera

We dwell in a molecular international, virtually closed shell in nature, and accordingly Chemistry has been a technological know-how facing closed shell mol ecules. even if, the excessive measure of experimental sophistication reached long ago decade has made extra obvious the position of open shell constructions in chemical examine. A parallel phenomenon should be saw within the improvement of SCF idea, the place closed shell molecular calculations at any point of complexity compose the most physique of references which might be bought in Quantum Chemistry this day. in addition to the linkage among experimental and theoretical behaviour, there are, evidently, different purposes which are hooked up to a scarcity of molecular open shell calculations. between others, there has been no connec tionbetween closed or open shell theoretical remedies. during this demeanour, many computational good points utilized by closed shell connoisseurs haven't been prolonged to different computational components. because the paintings of Roothaan in 1960, the open shell molecular panorama has been, the oretically, a truly closed one. additional improvement of SCF concept, which has resulted in an outburst of multiconfigurational methods, has paid no, or very faint, realization to the interconnection among those SCF conception complex gains, the open shell framework and closed shell universal perform. a very good theoretical objective, in general conversing, and specifically inside of SCF thought, could encompass a strategy which might be used to resolve a given chemical challenge, in the actual and approx imate limits of the theory.

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The value of a which has given the best convergence pattern in any case has been a 1. Also, at the * - A12 , self-consistent stage the values of the differences ~ = A21 which measure the degree of hermiticity of the off-diagonal Lagrange multipliers, have been computed to be ~10-6 for a convergence criterion of the eigenvector components with the value of 10- 6 • Table 1. IV collects the exponents, eigenvalues and vectors, total energy, virial coefficient, and i c series. ~ value for all the minima of the Li isoelectron- 3.

I aqilo;q>. 111) (16. III) I qEP ( I a . t )IO;q> = A. 111) I tqp a pi = Ai a qi ; PEP q,iEP. 111) T A = A A, with obvious definitions for matrices T, A and A. III)i from them can be obtained each modified eigenvector of R. Neither normalization nor orthogonalization needs to be carried out, that is

111) I tqp a pi = Ai a qi ; PEP q,iEP. 111) T A = A A, with obvious definitions for matrices T, A and A. III)i from them can be obtained each modified eigenvector of R. Neither normalization nor orthogonalization needs to be carried out, that is