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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 3 (1965), S. 341-346 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Singulettenergieniveaus des Benzol-Moleküls wurden mittels der vollständigen CI-Methode im Rahmen der π-Elektronennäherung für zwei Gruppen von halbempirischen Parametern berechnet. Der Einschluß von drei-, vier- und sechsfach angeregten Zuständen hat praktisch keinen Einfluß auf die Singulettenergieniveaus, wenn die Parameterwerte den halbempirischen Verfahren entnommen sind. Demgegenüber kommt bei Benutzung von Parameterwerten, die weitgehend theoretisch berechneten Molekülintegralen entsprechen, eine beträchtliche Änderung des Energiespektrums zustande.
    Abstract: Résumé Les énergies des états singulets dans la molécule de benzène ont été calculées par la méthode des interactions de configuration complète dans l'approximation π-électronique pour deux séries de paramètres semiempiriques. La considération des configurations tri-, tetra-, et hexaexcitées n'excerce pratiquement aucune influence sur les énergies des états singulets si l'on emploie les mêmes paramètres que dans les procédés semiempiriques. Si on emploie, par contre, des paramètres très similaires à ceux qui résultent des intégrales moléculaires calculées théoriquement, on constate des changements sensibles dans le spectre d'énergie.
    Notes: Abstract Singlet energy levels of benzene molecule were calculated using the complete CI method in π-electron approximation for two sets of semiempirical parameters. The inclusion of triply-,tetra-, and hexa-excited configurations has practically no effect on the values of singlet energy levels as far as parametrizations which are common in semiempirical procedures are employed. On the other hand, using parameters which are very similar to those obtained with theoretically calculated molecular integrals, appreciable changes in the energy spectrum are observed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical chemistry accounts 7 (1967), S. 256-258 
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the MO LCAO formalism, exact energy spectrum and wave functions of electrons in the one-dimensional model of a semi-infinite crystal were obtained. The model can be interpreted as a semi-infinite chain composed of two kinds of atoms connected alternately by strong and weak bonds. In addition to Tamm and Shockley surface states, Shockley subsurface states were obtained. It was shown, that the character of the surface state can change depending on its position in the forbidden energy band. Reasons for the occurrence of Shockley surface states are discussed. Results of this paper are compared with those obtained within the framework of Hückel approximation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 249-267 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Results obtained by various quantum-mechanical approaches in studying localized states on crystal surfaces are summarized and discussed. The one- and many-electron aspects of the problem are compared and shown to lead to similar results. Emphasis is laid upon localized chemisorption states on intrinsic semiconductors. The problem of the calculation of chemisorption heat on solid surfaces is also mentioned.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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