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A semiempirical method for treating unsaturated molecules in terms of electron pair functions

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Abstract

It is proposed to use the treatment of Girardeau for the calculation of energies of unsaturated molecular systems. This involves a second quantized formalism with electron pair basis functions. No strong orthogonality is assumed, instead a subsidiary condition is imposed on the state vectors. However this does not involve any approximation. Information regarding the ground and excited states can be obtained from various propagators. In order to determine these propagators the Green function method of the many body problem can be used.

Zusammenfassung

Es wird vorgeschlagen, Moleküle mit konjugierten Systemen nach einem Verfahren von Girardeau zu behandeln, das mit Geminalen ohne starke OrthogonalitÄt arbeitet. Man kann dabei die Greensche Punktion in der üblichen Weise benützen.

Résumé

Une théorie du type N-corps est formulée pour l'étude des molécules non-saturées avec les effects de corrélation en utilisant un formalisme de Girardeau avec une base de fonctions de paires électroniques, ou on ne suppose pas l'orthogonalité forte, mais impose à la place une condition sur les vecteurs d'état. Cependant ceci ne comporte aucune approximation. L'information relative à l'état fondamental et aux états excités peut Être obtenue à partir des différents propagateurs. Ces propagateurs peuvent Être déterminés à l'aide de la méthode de la fonction de Green du problème à N corps.

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Büti, G. A semiempirical method for treating unsaturated molecules in terms of electron pair functions. Theoret. Chim. Acta 8, 367–375 (1967). https://doi.org/10.1007/BF00529451

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