SC& results of appror;imate ab initio calctilations oi the "correlai.ion~' contribution to the true parameters of the pi electron hamiltonian XC presented fok the ethylenk.moiccule. In particular. by using sum-of-the-pairs type generalized perturbation theory, it is shown that there is a large core
A derivation of the exact pi-electron hamiltonian
โ Scribed by K.F. Freed
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 526 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The exact pi-electron hamiltonian isderived from the full many-electron Schriidinger equation. The derivation employs techniques which also enable the developmenr of open shell generalized perturbation theory. The parameters occurring in the pi-hamiltonian are therefore amenable to cakulation using the approximate theories and methods of Sinano&, Nesbet, Kelly, etc. To a good approximation, * 'Alfred P. SloGa Foundation Feilow. . f For areviq and further references see ref. .[ l] :
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๐ SIMILAR VOLUMES
Let A be an associative PI-algebra over a field F of characteristic zero. By studying the exponential behavior of the sequence of codimensions [c n (A)] of A, we prove that Inv(A)=lim n ร n c n (A) always exists and is an integer. We also give an explicit way for computing such integer: let B be a f